Opinion
Numbers behind different COVID-19 vaccines
By M. C. M. Iqbal
The vaccines against COVID-19, available today, are based on different strategies and come with different numbers to indicate their performance. Many of us wish to know if one vaccine is better than the other. Two concepts underlying the performance of the vaccines are efficacy and effectiveness. The Pfizer-BioNTech vaccine has an efficacy of 95 percent, the Moderna Vaccine is 94.5 percent and the Russian made Sputnik vaccine is over 90 percent. Does this mean some vaccines are better than the other? The short answer is no. All the approved vaccines are equally good. So, let us look at what these numbers mean.
These numbers refer to statistical calculations to interpret the results of vaccination trials conducted by the manufacturers of vaccines, following a prescribed format. The method of calculation was developed over 100 years ago by two statisticians, who published their results in the Proceedings of the Royal Society of Medicine in 1915. They, Major Greenwood (Major is his first name and not a military title) and Udny Yule, were tasked with interpreting the results of immunization of British soldiers against typhoid and cholera, who were fighting in different regions of Europe and Asia favourable to the development of cholera epidemics. In a paper stretching over 82 pages, the authors developed the theoretical and mathematical background for calculating the efficacy of vaccines.
This article seeks to explain to the lay reader what these numbers imply and to bring out the differences between efficacy and effectiveness of a vaccine.
Efficacy and effectiveness
At first sight these two terms appear to be synonyms. However, in the world of vaccines and medicine, these two terms are not the same. Efficacy of a vaccine is how it performs under ideal and controlled conditions in a clinical trial (see below). During clinical trials, the outcome of vaccination is compared between a group of vaccinated people and another group given an inactive form of the vaccine (called a placebo). The effectiveness of a vaccine is how the vaccine performs in the real world – that is after the vaccine is approved by the regulatory agencies and you and I are vaccinated.
The efficacy of a vaccine is measured by the manufacturers under ideal conditions in a clinical trial where criteria are specified for selecting and excluding volunteers. These criteria are usually age groups, gender, ethnicity, geographical location and socio-economic standing. If the criteria are specific, then the effects of the vaccine or drug would not be applicable across the population. For example, if the COVID-19 vaccines are not tested on children below 18 years, then the approved vaccine cannot be used on children.
The effectiveness of a drug or vaccine is a measure of how well the drug or vaccine performs in real life, in a diverse population: Fitness geeks and couch potatoes, housewives and nurses, and farmers and office workers. Effectiveness is of relevance to the medical community and healthcare authorities who are treating the patients. Thus, studies on effectiveness would look at to what extent the vaccine is beneficial to the patient to prevent infection.
One may ask, why not simply look at the effectiveness of the vaccine? This is because if the participants in an initial trial of the vaccine are not carefully controlled, then it is difficult to interpret the outcome of the trial. We have many characteristics, which can potentially interfere with the outcome of a trial testing a vaccine. The person volunteering for the trial could be young or old, pregnant or not, a marathon runner or an average person and smoker or non-smoker. Thus, the volunteers selected for the trials are very similar within their groups with many criteria to exclude persons who could confuse the results (for example, an unhealthy person with other diseases would be excluded).
Efficacy of a vaccine asks the question ‘Does the vaccine work under ideal conditions?’ On the other hand, a study on the effectiveness of the same vaccine asks the question ‘Does vaccination work in the real world?’
Clinical trials
Under normal circumstances, vaccines take many years of research and testing to be approved. The COVID-19 pandemic was unprecedented, and pharmaceutical companies embarked on a race against time to produce safe and effective vaccines. The genome of this coronavirus, which was discovered by Chinese scientists, in January 2020, was a major contribution to the development of the vaccines. At the moment there are 94 vaccines being tested on humans in clinical trials, 32 of which have reached the final stage of Phase 3 testing.
To obtain approval for a vaccine, the vaccine manufacturers go through a prescribed process to ensure that the vaccine is safe. All the countries have a national drug approval agency, who should approve the use of a drug or vaccine in that country. The Food and Drug Administration (FDA) in the United States is an important regulatory agency, which has stringent criteria to approve medicines and drugs. In Sri Lanka, it is the National Medicines Regulatory Authority. COVID-19 vaccines are also assessed and approved by the WHO.
Initially, the vaccine is tested on cells in the laboratory and then given to animals, usually mice or monkeys. After this, if the mice or monkeys are happy, human volunteers are recruited to conduct the clinical trials, which is done in three phases. In the first phase, the vaccine is tested on a small group of people to determine the safety, dosage and ability to stimulate our immune system. If this is confirmed, the vaccine then moves into the Phase 2 stage where the safety of the vaccine is tested on hundreds of people who are split into different groups. Once these trials are successful, the vaccine moves to the final Phase 3 trials. Here thousands of people are recruited as volunteers. For the Pfizer-BioNTech vaccine there were over 40,000 volunteers, above the age of 16, from different countries. This trial is more comprehensive, with the volunteers belonging to different age groups, physical fitness, ethnicities and geographical locations. The volunteers are divided into two groups. One group gets the real vaccine while the other group gets a fake vaccine or placebo (the syringe has just water). The volunteers would not know if he/she is getting the vaccine or a placebo and neither do the nurses and doctors giving the vaccine. This is called a double-blind clinical trial. Thus, no one knows, except those conducting the trial, who was vaccinated with what.
After some time, the volunteers, who fell sick with the coronavirus, are PCR tested to confirm if they are COVID-19 positive. The scientists will be on the lookout for any side effects of the vaccine; if they find any cause for concern the trial can be stopped temporarily to conduct investigations and remedy the problem. If the scientists are not satisfied, the trial would be abandoned. Once the results are in, the calculations are done, and all the details are submitted to the regulating authorities. The regulators would ask the manufacturers more questions and once they are satisfied, approval is given to manufacture and market the vaccine. To accelerate the process, such as now during the COVID-19 crises, Phase 1 and 2 may be combined and run in parallel.
Calculating efficacy
The calculations involved are quite simple once the data is collected. Let us assume that 50,000 volunteers were recruited for the vaccination trial. Half were given the vaccine and the other half a placebo. Let us assume that of the 25,000 who received the vaccine, 10 persons were infected, and of the other 25,000 who received the placebo, 200 were infected. Although the numbers of people infected are small, those in the placebo group are 20 times larger (see Table). The researchers are concerned with the relative risk between the groups. This is called the efficacy of the vaccine.

The risk of infection is calculated as follows.
What is the difference in the risk of infection between the vaccinated group and those who got the placebo? From the table this is, 0.80 percent – 0.04 percent = 0.76 percent.
Thus, the vaccine reduced the risk of infection by 0.76 percent, which looks quite small. This is what would happen if we are vaccinated. To understand this in terms of the risk of infection, if none were vaccinated, we look at the ratio of the Reduction in Infection (0.76 percent) to the Risk of infection (0.80 percent – those who got the fake vaccine). This is the Vaccine Efficacy (VE).
VE percent = Reduction in infection ÷ Risk of infection = 0.76 ÷ 0.80 = 95 percent
If this is still confusing, let us see what it means in a population of 100,000 persons who are vaccinated with a vaccine of 95 percent efficacy, and exposed to the virus. From the table above, the risk of infection for the vaccinated population is 0.04 percent, which translates to 40 persons (0.04 percent x 100,000). That is, we can expect that 40 persons would fall ill with an infection by the coronavirus and the rest of the vaccinated people may not develop an infection at all or develop an asymptomatic infection (you are infected but do not show symptoms) or get a mild disease.
(This example of calculating Vaccine Efficacy is adapted from an article by Dashiell Young-Saver in the New York Times of December 13, 2020, where the above calculation is explained in detail for students.)
What does efficacy mean?
The efficacy of a vaccine refers to two aspects. The first is how many of us are protected by the vaccine if we are exposed to the virus; this is given by the percentage. The vaccine also refers to different disease conditions it is capable of preventing. This could be causing an infection, mild disease, severe disease, hospitalisation, or death. This information can be found if one looks carefully at the statements issued by the vaccine manufacturer and regulatory agencies. For example, the statement by Pfizer-BioNTech states: Pfizer-BioNTech COVID-19 vaccine, BNT162b2, was 91.3 percent effective against COVID-19 (symptomatic cases of COVID-19), measured seven days through up to six months after the second dose. The vaccine was 100 percent effective against severe disease as defined by the US centres for Disease Control and Prevention (CDC), and 95.3 percent effective against severe disease as defined by the US FDA.
The efficacy of a vaccine (VE) is the relative reduction of being infected, if we are vaccinated, compared to the placebo or unvaccinated group. If the vaccine is perfect, then the risk of being infected is totally eliminated, so that VE = 1 or it is 100 percent. On the other hand, if there is no difference in the number of people infected between the two groups, the vaccine has no efficacy, or it is zero. Even with a perfect vaccine, our capacity to acquire an infection is determined by our age, health and immunity status.
In short, efficacy is a statistical measurement based on clinical trials of the vaccine’s ability to prevent infection. The volunteers taking part in the trials are not a perfect sample or representative of the real world (for example, children and sick people do not take part). Is there a lower limit for the efficacy of a vaccine to be accepted? Under the present circumstances, the FDA said it would consider granting emergency approval if the vaccines showed even 50 percent efficacy; the vaccines that have received approval now show an efficacy of over 90 percent.
Effectiveness
The effectiveness of the vaccine tells us how well the vaccine is performing among the population, in the real world, to prevent infection. The effectiveness of the vaccine depends on the impact it makes on society. After vaccination our immune system is primed to combat the coronavirus, reducing the multiplication of the virus in our body. This will gradually slow down the spread of the virus as more and more people are vaccinated. In other words, it is important that most if not all the people are vaccinated to have a large impact on the spread of the virus in society. Good examples are the smallpox vaccine, which completely eliminated the smallpox virus, and the polio vaccine, which has almost wiped out the polio virus except for a few small pockets in Pakistan, Afghanistan and Africa. Thus, the effectiveness of a vaccine looks at the medical and societal importance of the outcome.
Here is the above in a nutshell. The percentage numbers given with a vaccine refers to its efficacy – its ability to prevent an infection developing into a serious condition, determined under controlled clinical trials. Vaccines do not prevent infection – they prevent the infection from developing into a severe disease. Once we are vaccinated, our immune system is activated. If we are infected by the coronavirus, the virus has a small window of time to multiply, before it is eliminated by our immune system. This means we can release virus particles from our body, but much less than if we were not vaccinated. The message is we should get vaccinated with the first available vaccine and still wear our masks when going outside, even if we are vaccinated. The chances of ending up in a hospital is low and the chances of ending up in the ICU is very low. There is always a chance.
‘Tis impossible to be sure of anything but Death and Taxes (Christopher Bullock, 1716).
(M.C.M. Iqbal is Associate Research professor, Plant and Environmental Science, National Institute of Fundamental Studies, Hanthane Road, Kandy, and can be reached at iqbal.mo@nifs.ac.lk)
References
Zimmer, C. New York Times Nov. 20, 2020. Two companies say their vaccines are 95 percent effective. What does that mean?
Haelle,T. Association of Health Care Journalists. October 22, 2020. Know the nuances of vaccine efficacy when covering Covid-19 trials. https://healthjournalism.org/blog/2020/10/know-the-nuances-of-vaccine-efficacy-when-covering-covid-19-vaccine-trials/
Greenwood, M., & Yule, G. U. (1915). The Statistics of Anti-typhoid and Anti-cholera Inoculations, and the Interpretation of such Statistics in general. Proceedings of the Royal Society of Medicine, 8 (Sect Epidemiol State Med), 113–194.
Food and Drug Administration, US Department of Health and Human Services. https://www.fda.gov/media/139638/download
Opinion
A neighbour’s view of India’s strategic strengths
What India chooses to do with the strategic freedom it has built over eight decades may be the defining question of its next phase
by Milinda Moragoda
In the emerging global economy, countries will increasingly seek multiple sources of energy, technology, capital, minerals and markets. India can contribute by helping create an open network rather than another exclusive bloc.
As India marks eight decades of Independence, its strategic position has changed almost beyond recognition. Yet the central question of strategic autonomy remains. What India chooses to do with the strategic freedom it has built over eight decades may be the defining question of its next phase.
India has spent the past decade expanding its strategic choices — deepening ties with the US, Europe and Japan while maintaining important ties with Russia and strengthening engagement with the Gulf, Africa and Southeast Asia. Australia and New Zealand are also becoming increasingly important partners in the wider Indo-Pacific. At the same time, India has sought a larger voice for the developing world in international institutions. Strategic autonomy has traditionally been understood in diplomatic terms: the ability to maintain freedom of action without being drawn into competing power blocs. In an increasingly interconnected world, however, that freedom will depend just as much on economic choices.
The objective should be strategic interdependence — building sufficiently diverse relationships that dependence on any one country or economic system does not become a vulnerability. India is unusually well placed to pursue this. Its geography connects the Gulf and wider West Asia, the manufacturing economies of Asia, Africa across the Indian Ocean and the Eurasian space extending through Russia. The opportunity, therefore, is to become a connector between economies increasingly fragmented by geopolitical competition.
India’s relationship with Japan is extending into advanced manufacturing, technology, energy, semiconductors and critical minerals. Its engagement with the US is deepening across technology, investment, advanced manufacturing, energy and strategic cooperation, while its engagement with Europe is becoming increasingly economic and technological. Its relationships with the Gulf are expanding beyond energy into investment and connectivity. Australia and New Zealand add an important southern dimension to its wider Indo-Pacific engagement, while Southeast Asia provides pathways into wider Asian production networks.
Russia remains an important part of this equation. India’s continuing engagement with Moscow, alongside its deepening relationships with Washington, Tokyo, Europe and the Gulf, demonstrates that strategic autonomy gives India the flexibility to maintain important relationships across geopolitical divides.
China inevitably occupies a special place in this landscape. India’s answer cannot be either excessive dependence or complete separation. It will require strengthening domestic capabilities, diversifying supply chains and building partnerships elsewhere, while retaining space for engagement where interests permit.
India possesses another asset that few countries can match: a large, globally active and influential diaspora. Yet the diaspora can also present challenges, as political currents within these communities do not always align with India’s interests and can occasionally create sensitivities in its relations with host countries. The greater opportunity lies in nurturing the economic, intellectual and cultural connections the diaspora can create, while respecting its diversity and independence. In the emerging global economy, countries will increasingly seek multiple sources of energy, technology, capital, minerals and markets. India can contribute by helping create an open network rather than another exclusive bloc.
Ports, shipping routes, energy corridors, digital infrastructure, supply chains and trade agreements increasingly shape strategic influence. India’s challenge is to bring these strands together without turning them into a closed sphere of influence.
India’s economic rise will be more sustainable if other countries see themselves as participants in its growth rather than simply as markets for it. The value for India lies in making these relationships complementary rather than choosing among them. India’s leadership of the Global South can now move beyond representation in international forums towards creating an international economic environment in which developing countries have greater choices. India’s own experience is relevant here. It has moved from a relatively closed economic model towards deeper global integration while retaining a strong emphasis on domestic capability. The lesson is that openness and strategic autonomy need not be contradictory.
As the G20 meets again in Miami in December, India can continue to argue that the Global South should not merely seek greater representation within existing institutions, but a greater stake in shaping the economic networks and institutions of the future. An economically integrated Indian Ocean could allow countries such as Sri Lanka, Bangladesh and the Maldives to participate more deeply in regional supply chains, logistics, energy, tourism, technology and services. Influence based on shared prosperity is more durable influence based on dependence. India’s strategic opportunity, therefore, lies in becoming one of the principal connectors of a changing world.
(Milinda Moragoda is founder of the Pathfinder Foundation, strategic affairs think tank, and can be contacted via email @milinda.org.)
Courtesy Hindustan Times
Opinion
Financing Sri Lanka’s post-IMF development
by By Kasun Kariyawasam
and Shiran Illanperuma
In March 2027, Sri Lanka’s Extended Fund Facility with the International Monetary Fund (IMF) will expire. It is the seventeenth arrangement the country has entered into with the Fund since 1965. That number is not a footnote; it is the argument. Sixteen previous left the underlying structure of the economy intact – an economy that imports what it consumes, exports what it cannot process further, and borrows to cover the difference. Each programme ended, and the conditions that produced it reassembled themselves.
The seventeenth has been the most invasive. Approved on 20 March 2023, in the aftermath of the sovereign default and the uprising that followed, it arrived at a moment of maximum leverage for the creditor and minimum room for the debtor. Fiscal consolidation was achieved primarily through indirect taxation, so that the burden fell heaviest on the poor. Energy subsidies were withdrawn and utility pricing made cost-reflective, transmitting global price movements directly into household budgets and industrial input costs. Public investment was compressed, and public sector wages held below inflation for years.
The revenue target was met but the social consequences are now well documented.
First, poverty in Sri Lanka roughly doubled after 2022 and has remained near a quarter of the population – a level not seen for two decades. Malnutrition among children, school dropout, and the depletion of household savings and assets are the transmission channels through which a fiscal adjustment becomes a lost generation.
Second, the most mobile and most skilled workers – nurses, doctors, engineers, IT workers – have left in numbers that constitute a structural loss of productive capacity, subsidised by the Sri Lankan state and captured by the labour markets of the Gulf, East Asia, and the West.
Third, and the least discussed, is the loss of economic sovereignty. The Central Bank Act of 2023 grants the Central Bank of Sri Lanka operational independence under a narrow inflation-targeting mandate and prohibits the monetary financing of government deficits, removing an instrument of development finance that every industrialised economy used on its way up. The Economic Transformation Act of 2024 legislates the programme’s own quantitative targets as binding statutory obligations on all future governments.
Although the IMF programme ends in March 2027, the framework it installed does not. Austerity has been converted into a legal architecture. Any government that wishes to finance development after 2027 will find that the fiscal space to do so has been pre-emptively legislated away, and that the debt service profile steps up sharply from 2028 as the restructured bonds begin to amortise in earnest.
The instruments on the table
Three instruments are currently under discussion for managing the debt portfolio. Each is worth examining on its merits, and each shares a common limitation.
Macro-linked bonds.
The upside triggers are more likely to be hit than the underlying real economy warrants, because the reference variable is dollar GDP. A nominal appreciation of the rupee lifts dollar GDP without a single additional unit of output being produced. The control variable intended to guard against precisely this – a requirement of 11.5% cumulative real growth – is a low bar following two consecutive years of contraction, when the base effect alone does much of the work. The country may find itself paying creditors a growth premium for an exchange rate movement.
Climate swaps.
Debt-for-nature and debt for-climate arrangements can retire a portion of the stock and may unlock multilateral climate grants, which are concessional. But they do not address the productive structure that generates the deficit in the first place, and their conditionalities – conservation commitments over land, forest, and coastal zones – can cut directly against the industrial and energy build-out that any serious development strategy requires. A country cannot finance debt relief by constraining its own industrialisation.
Bond buybacks. Retiring restructured bonds converts a contingent, complex portfolio into a plainer one, which makes debt management tractable. If the bonds trade below face or recovery value, Sri Lanka retires debt at a discount. Lazard reportedly advised this course for Zambia, so the playbook exists. However, Sri Lankan bonds have performed strongly since the restructuring, which means the discount that would make a buyback attractive has largely disappeared. A buyback becomes cheap only if sentiment softens again, or if specific contingent tranches are marked down on fear of the upside triggers. Moreover, a sovereign buying back its own debt shortly after a restructuring invites the interpretation that it anticipates difficulty, which raises the cost of future issuance. Selective buybacks are worth pursuing, given the uncertain external environment and the value of a cleaner portfolio, but that they are a marginal improvement rather than a solution.
All three instruments manage the existing stock of debt. None of them generates new finance for development. They are exercises in liability management, and a country cannot manage its way out of underdevelopment. Sri Lanka needs relief and it needs capital, and the current conversation addresses only the first.
Building the domestic architecture
New financing without new institutions reproduces the crisis. Before Sri Lanka seeks capital abroad, it must rebuild the machinery that governs how it borrows.
The primary dealer system requires reconstruction on a proper legal footing. Before the crisis, the primary dealer network degenerated into a captive placement channel: when the central bank could no longer absorb unsold stock, dealers took paper on terms set by proximity rather than price. This is allocation by moral suasion, and it produced a domestic debt market that told the government nothing useful about the cost of its own borrowing. Rebuilding it with binding contractual obligations, genuine capital requirements, and published performance rankings – as China does for its own dealer network – would restore price discovery. A government that cannot read a true yield curve cannot manage a debt portfolio.
Sri Lanka also needs a published Medium-Term Debt Management Strategy (MTDS) with explicit targets for the composition of the portfolio: external against domestic, concessional against commercial, and fixed against floating rate. Borrowing at present is reactive, driven by immediate financing needs rather than by a strategic view of currency, rollover, and interest rate risk. An MTDS makes those trade-offs visible and accountable. It is unglamorous and it is prerequisite.
The China angle
Sri Lanka’s most underused financial asset is its existing relationship with China’s monetary and capital market infrastructure. A currency swap line of 10 billion RMB is already in place, renewed in 2025, and it functions almost entirely as a passive reserve backstop. It could be the foundation of a financing strategy.
Broaden the use of RMB for trade settlement.
The swap is presently constrained in its permitted uses. Extending it to cover bilateral trade invoicing and settlement would reduce the dollar dependency that is the primary transmission channel for external volatility into the Sri Lankan economy. Every import invoiced in dollars is a claim on reserves that fluctuates with US monetary policy, over which Sri Lanka has no influence whatsoever.
Request eligibility for the FIMA RMB repo facility.
China’s facility, announced in June 2026, provides eligible central banks with access to RMB liquidity against holdings of Chinese government bonds. For Sri Lanka this would mean an RMB reserve buffer that is genuinely liquid rather than notional, and a second source of emergency liquidity that does not require a Fund programme as its precondition.
Issue panda bonds in the onshore Chinese market.
Sri Lanka has already begun refinancing dollar-denominated loans from Chinese banks into RMB, which establishes the precedent and the relationships. Issuance in the Shanghai interbank market would lock in RMB funding at rates below what the Eurobond market will offer a recently defaulted sovereign, and it diversifies the creditor base away from the Paris Club and Western commercial holders whose collective action in 2022 and 2023 was itself a lesson in concentration risk.
Access the offshore dim sum market in Hong Kong.
The offshore CNH market is deep – new issuance reached $157.2 billion in 2025 – and is a plausible source of medium-term infrastructure financing on terms that do not carry policy conditionality.
Integrate with CIPS.
None of the above scales without payments infrastructure. Integration with China’s Cross-Border Interbank Payment System reduces exposure to dollar-clearing volatility, carries lower transaction costs than routing through SWIFT correspondent banking, and is what allows the swap facilities to be used at volume rather than symbolically.
Establish direct LKR–RMB settlement.
Building on the Indonesia–HKMA–PBoC framework of June 2026, a direct settlement mechanism for bilateral trade would give Sri Lanka a working channel into one of the largest markets in the world, and create a pipeline for foreign direct investment and other inflows that does not transit the dollar system at all.
Multipolarity as infrastructure
What Sri Lanka should build is a blueprint for a local currency settlement corridor that can be scaled to any partner. Begin with China, where the infrastructure already exists, and extend it to India, the country’s nearest neighbour and one of its largest trading partners, where rupee settlement arrangements are already operating with other states. The same institutional template – bilateral swap, direct settlement mechanism, payments system linkage, local currency invoicing – applies to any counterparty with which Sri Lanka has meaningful two-way trade.
The immediate prize is energy. A large share of Sri Lankan inflation originates in oil, transmitted through both the world price and the exchange rate at which it is paid. That volatility does not merely raise the cost of living; it creates genuine industrial hurdles, because manufacturers cannot plan around input costs that move with a currency they do not earn. Denominating energy imports in local currency terms would break one of the most damaging transmission channels between external shocks and domestic prices. For a country whose recent history is defined by a fuel queue, this is not an abstraction.
Multipolarity, understood correctly, is a portfolio strategy. A sovereign with settlement channels in several currencies, funding relationships across several capital markets, and reserve buffers denominated in more than one unit of account is a sovereign with options during a crisis. Sri Lanka in 2022 had none, and the terms it accepted in 2023 reflect that.
Opinion
El Niño: Sri Lanka must prepare before next climate crisis arrives
By Chula Goonasekera,
on behalf of the LEADS Forum
Based on discussions with Ajith Wijemanna, Director General of the Department of Meteorology, and Kithsiri Abayasinghe, former Director of the Department of Meteorology
Sri Lanka may be facing another major natural challenge. Unlike many disasters, however, the warning signs are already visible, giving the country an opportunity to prepare before the situation becomes critical.
A recent discussion with two of Sri Lanka’s most experienced meteorologists highlighted concerns about the developing El Niño phenomenon and its potential consequences for the country. While no scientist can predict with certainty exactly how El Niño will evolve, current indications suggest the possibility of above-normal rainfall later this year, followed by reduced rainfall and potentially severe drought conditions in early 2027.
This is a warning Sri Lanka cannot afford to ignore.
Most Sri Lankans still remember the devastation caused by the Indian Ocean tsunami in December 2004. El Niño is fundamentally different. It does not arrive as a single catastrophic event. Instead, its effects can develop over many months, potentially bringing drought, water shortages, crop failures, extreme heat, wildfires, flooding and food insecurity.
The critical difference is that, unlike a tsunami, El Niño gives us time to prepare.
Sri Lanka therefore has a choice: act on the warnings now or pay a far greater price later.
We Must Not Wait for Disaster
The 2004 tsunami exposed Sri Lanka’s vulnerability to large-scale disasters and demonstrated the immense human and economic costs of inadequate preparedness.
El Niño cannot be prevented. However, many of its potentially damaging consequences can be reduced through early planning, effective coordination, public awareness and practical risk-reduction measures.
The purpose of this article is not to predict exactly what will happen. Rather, it is to ask a more important question:
Are we prepared for what could happen?
Depending on the intensity and evolution of El Niño, Sri Lanka could face:
· severe drought and prolonged dry spells;
· water shortages affecting households, agriculture and industry;
· reduced agricultural production and increased food insecurity;
· increased risks of forest and grassland fires;
· heatwaves and heat-related illness; and
· localised flooding caused by unusually heavy rainfall.
One threat deserves particular attention: wildfires.
During prolonged dry periods, fires can spread rapidly through forests and grasslands, destroying ecosystems, wildlife habitats, agricultural land, livelihoods and critical infrastructure, while placing enormous pressure on emergency services.
The lesson is straightforward: understanding potential worst-case scenarios before they occur greatly improves our ability to prevent them from becoming national catastrophes.
A Crucial Role for Disaster Management
We understand that Sri Lanka’s Disaster Management Centre (DMC) is already engaged in preparing the country for the potential impacts of a stronger El Niño event. Its focus must remain on helping communities prepare before emergencies arise, while ensuring that essential services continue to function during periods of crisis.
Disaster response and recovery come at a high cost to the public through government expenditure and taxpayer-funded resources. Investing in preparedness is therefore not only a humanitarian responsibility but also a sound economic strategy—particularly at a time when Sri Lanka continues to face considerable fiscal constraints and limited capacity to absorb another major shock.
The principle is clear:
Prevention is invariably less costly than recovery.
Every rupee invested in preparedness today can help prevent far greater social and economic losses tomorrow.
Listen to the Scientists
The public should pay close attention to forecasts and guidance issued by the Department of Meteorology.
At the same time, it is important to recognise that long-range forecasting is inherently complex. Climate systems involve countless interacting variables, many of which cannot be measured or predicted with complete accuracy months in advance.
When a forecast subsequently changes, this should not automatically be regarded as a failure of science. Forecasting is, by its nature, an assessment of probabilities and risks based on the best available evidence at a particular point in time.
The appropriate response is not to dismiss forecasts because they contain uncertainty, but to use them as tools for informed preparation.
What Should the Government Do?
The Government and relevant public institutions should urgently review Sri Lanka’s preparedness for drought, flooding, wildfires and extreme heat.
Key priorities should include:
· strengthening climate monitoring and early-warning systems;
· improving weather forecasting and public communication;
· developing comprehensive drought, flood and wildfire preparedness plans;
· enhancing reservoir, catchment and water-resource management;
· maintaining drainage infrastructure to reduce urban flooding;
· strengthening wildfire prevention, detection and response capabilities;
· investing in climate-resilient infrastructure; and
· establishing clear lines of responsibility and coordination among government agencies.
Coordination is particularly important. During a national emergency, citizens should never be left wondering which institution is responsible for taking action.
Water Security Must Be a National Priority
If prolonged dry conditions materialise, water security could become one of Sri Lanka’s most pressing challenges.
The country should strengthen groundwater protection, support the rehabilitation and maintenance of wells, and implement long-term water-security strategies in drought-prone regions. Such measures are important not only for human communities but also for agriculture, livestock and the natural ecosystems that sustain the country’s biodiversity.
Reservoirs and catchments must be managed carefully, while water conservation should be actively promoted among households, businesses, industries and farmers.
The key question is simple:
How much water will Sri Lanka require if the dry season lasts significantly longer than expected?
That question is far easier to answer before reservoirs begin to run dry.
Protecting Agriculture and Food Security
Agriculture remains highly vulnerable to drought and irregular rainfall. Significant disruption could result in rising food prices, reduced farm incomes and increased pressure on vulnerable households.
Sri Lanka should accelerate the adoption of drought-resistant crops, climate-smart farming techniques and efficient irrigation systems, including drip irrigation. Measures should also be taken to secure water and feed supplies for livestock, maintain strategic food reserves and strengthen weather-based advisory services for farmers.
Food security must be regarded not merely as an agricultural concern but as a matter of national resilience.
Preparing for Wildfires
Prolonged dry conditions can significantly increase wildfire risks. Sri Lanka must strengthen its capacity to prevent, detect and respond to fires before they escalate.
An effective strategy should rest on four pillars:
Prevention. Preparedness. Early detection. Rapid response.
Seasonal climate forecasts should be used to identify periods of heightened risk. Vegetation dryness, weather conditions and fire-prone regions should be monitored systematically, with modern technologies used wherever feasible.
Firebreaks should be established and maintained around vulnerable communities, forests and critical infrastructure. Dry vegetation and other combustible materials should be appropriately managed. Where environmentally and scientifically justified, carefully regulated controlled burning could also form part of an integrated fire-management strategy.
Human activity is responsible for many wildfires. During high-risk periods, open burning should therefore be restricted and unsafe land-clearing practices rigorously controlled. Public education campaigns should reinforce these measures.
Firefighting resources should be pre-positioned in high-risk areas before peak fire seasons begin. Adequate equipment and water supplies should be secured, and coordination strengthened among local authorities, fire services, forestry officials, disaster-management agencies and, where necessary, the armed forces.
Where practical and affordable, aerial firefighting capabilities should also be considered.
The guiding principle is straightforward:
Fight fires when they are small, rather than after they become uncontrollable.
Protecting Sri Lanka’s Natural Ecosystems
Healthy ecosystems are among the country’s most effective natural defences against climate stress.
Sri Lanka should protect wetlands and other water-retaining ecosystems, conserve forests, prevent unnecessary land clearing and fragmentation, and safeguard wildlife habitats from fire and degradation.
Forest conservation is not simply an environmental issue. It is central to water security, food security, biodiversity protection, public health and long-term national resilience.
Citizens Also Have a Responsibility
Preparedness cannot be the responsibility of government alone.
During dry periods, households should conserve water and avoid unnecessary waste. Communities should ensure that wells are cleaned, maintained and restored where necessary, particularly if prolonged disruptions to piped water supplies occur.
During periods of extreme heat, people should remain hydrated, avoid unnecessary outdoor activity and follow public health advice.
Families should maintain basic emergency plans and supplies. Communities in fire-prone areas should know evacuation routes and designated safe assembly points. Citizens should also avoid activities that could inadvertently start fires and remain alert to official warnings.
Particular attention should be given to vulnerable groups, including older people, people with disabilities and those with limited mobility. Communities should also be prepared for the health effects of wildfire smoke and deteriorating air quality.
From Response to Preparedness
Sri Lanka’s greatest challenge is not responding when disaster strikes. It is ensuring that natural hazards do not develop into national catastrophes.
This requires a fundamental shift from a culture of reaction to a culture of preparedness.
Government agencies, scientists, farmers, businesses, schools, community organisations and individual citizens all have important roles to play. A coordinated approach combining climate forecasting, land management, public education, community preparedness, early-warning systems and rapid emergency response can significantly reduce the risks posed by El Niño and other climate-related threats.
Even if severe drought conditions do not materialise, investments in preparedness will strengthen Sri Lanka’s resilience against future disasters. If severe conditions do occur, early preparation could save lives, protect livelihoods, reduce economic losses and prevent a difficult situation from escalating into a national crisis.
Sri Lanka has already learned, at enormous cost, the consequences of being unprepared. We should not wait for another disaster to teach us the same lesson.
The warning signs are present. The scientists are speaking. The risks are increasingly clear.
What remains is the political will and public commitment to act.
Preparation today will always cost less than recovery tomorrow.
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