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Sri Lanka’s gas tragedy: the untold story

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By Deshai Botheju, Ph.D.
M.Sc.Tech.(Norway), M.Sc., B.Sc.Eng. (1st Hons., UoM), AIChE, AMIE(SL)
deshaibotheju@acses.org

Recent explosions and gas leak accidents related to domestic LP gas cylinders have created an environment of fear, anxiety, and social unrest throughout the country. More than 400 explosions and gas leak incidents have been reported during the first week of December 2021. In addition, a large number of observations have been made with respect to leaking gas cylinder valves.

The reported accidents and incidents can be divided into four major categories: (a) Sudden gas explosions inside houses and building, (b) Sudden explosions associated with the gas cooker, (c) Major gas leaks and resulting damages associated with the regulator and the hoses, (d) Minor gas leaks from the cylinder valve, regulator, or the hoses. The number of accidents reported during a single week has far exceeded the typical gas-related accidents happening within a typical year. Something must have gone terribly wrong for Sri Lankan LP gas consumers. Unconfirmed reports now indicate potential deaths, associated with some of these gas explosion accidents.

What is LPG?

Liquefied Petroleum Gas, abbreviated LPG, is an energy carrier derived during crude oil refining or natural gas processing. In petroleum industry terminology these are called gas condensates and are byproducts often generated during the production of liquid fuels (gasoline, diesel, and kerosene) or natural gas (methane). The key components of typical LP gas are propane (an alkane gas containing three carbon atoms – C3H8) and butane (an alkane gas containing four carbon atoms – C4H10). In addition, small amounts of propylene, methane, pentane and other minor constituents can be present. LP gases do not originally have a clearly recognizable distinct odour. Therefore, in order to identify any gas leaks, methyl mercaptan (CH3SH), or a similar odour generating component, is added to LP gas before commercial use. Table 1 provides a useful comparison between propane and butane, with respect to key physical or chemical properties.

Depending on the refinery process, or intended use, LP gas can have a widely varying propane and butane composition. Under normal atmospheric pressure, butane has a higher boiling point of minus 0.5 degrees Celsius (-0.5) compared to propane’s minus 42 degrees Celsius (-42) boiling point. That means in colder climates, where the ambient temperature could go below 0 degrees Celsius, the LP gas must mostly contain propane in order to use that as a fuel gas (otherwise it wouldn’t flow as a gas, as butane would remain in the cylinder as a liquid). Therefore, the butane content is greatly reduced in LP gas used in colder climate countries, typically less than five percent of the volume. For tropical countries, like Sri Lanka, having a high butane content is just fine, as the year-round temperature is almost always above zero degrees Celsius (except for some rare occasions in locations at higher altitudes). Further, butane is a much safer gas to use. This is due to its much lower vapour pressure (31 pound per square inch) compared to that of propane (124.5 psi). Therefore, the containment integrity requirements shall be much stricter for propane use, compared to butane. (figure I)

Composition changes and pressure effects

Unlike compressed gas cylinders, LP gas cylinders are not filled with 100 percent gas. Instead, a new cylinder would contain the liquids, hence the name LP gas, to about 85 percent volume. Only the remaining 15 percent ullage volume (the volume left empty in a tank for the liquid to expand) contains actual gas. These two phases (liquid and gas) are in equilibrium. The pressure within this gas filled ullage is the equilibrium pressure of the corresponding liquid mixture (of propane and butane). This equilibrium pressure can be predicted based on the ambient temperature and the composition of the liquid phase. Table 2 provides the values of these equilibrium pressures (in pounds per square inch gauge or psig) for different propane-butane mixtures at the temperature of 32 degrees Celsius (which is quite close to the typical ambient temperature in Sri Lanka). (Figure II)

As can be seen from Table 2, at 32 oC temperature, a mixture of 80 percent butane and 20 percent propane has an equilibrium pressure of 53.6 psig. This was the composition used in Sri Lanka for a long time. All appliances (including gas cookers), pressure regulators, hoses, hose connectors, gas cylinder valves and cylinders have been accustomed to this pressure condition. In other words, our consumer gas utility system has been calibrated at this pressure condition. Nevertheless, gas cylinders themselves are manufactured to tolerate a much higher pressure.

If the butane-propane composition is suddenly changed to 50 % butane and 50 % propane, now the increased propane content leads to a much higher equilibrium pressure of 89.4 psig. It is obvious that this is a very significant pressure increase from the previous condition.

Containment integrity

Increased propane content leads to a significant increase in gas pressure inside the cylinder. This is because propane has a much higher equilibrium vapour pressure compared to butane (see Table 1). Now, the whole utility system on the part of the customers faces a containment integrity problem. In other words, gas leaks are likely to happen from many of the system components. Table 3 elaborates potential impacts of this pressure increase on different system components. Figure 1 further illustrates potential leak sources and pathways associated with the gas cylinder valve. (Figures III and IV)

What happens during a gas leak?

Propane and butane are flammable and combustible gases, when mixed with air (or oxygen). Within the approximate volume percentages of 2 to 10 percent (within LEL- Lower explosive limit and UEL – Upper explosive limit), these gases can create an explosive gas mixture when exposed to air; see Table 1. Outside of this volume percentage range, the gas would not ignite. However, at higher gas concentrations, the gas cloud can still pose an asphyxiation hazard to humans as it displaces breathable oxygen in air.

Even a minor gas leak in the cylinder valve, regulator, or any other component (see Table 3 and Figure 1) can lead to the accumulation of the gas inside a building, over several hours. Note that both propane and butane gases are higher in density compared to air (heavier than air; see specific gravity values shown in Table 1). Which means, when a gas leak occurs the explosive gas cloud accumulates close to ground level (rather than moving upward and dissipating). This situation is more likely to occur at night when doors and windows are closed, with consequently little or no ventilation. If the leaked cloud of gas reaches the concentration of LEL within that surrounding (for example a kitchen), then it is a bomb waiting to be triggered at any time. The only thing required is a small spark, which may occur when an electrical switch makes contact (on or off), or even due to static electricity present in the atmosphere, or due to an actual flame such as lighting a match. At that moment, an explosive combustion reaction occurs within the flammable gas cloud and the energy released is transmitted as a pressure wave accompanied often by a fireball. This is a typical atmospheric gas cloud explosion. Secondary damage can occur due to projectiles (broken glass for example), prolonged fires, collapsing roofs and walls.

Change management failure

Changing an existing LP gas composition without a detailed safety assessment is an act of sheer negligence bordering on absurdity. It’s a fundamental process engineering principle to follow a comprehensive Management of Change (MoC) protocol before making this kind of, or even far less consequential, change to a product, process, or an operating procedure. Even a Process Engineering Trainee can explain this to production management. As part of an MoC process, it is absolutely necessary to conduct a dedicated risk assessment or a standard safety study such as ‘HAZards and Operability’ (HAZOP). Had such HAZOP been conducted in this case, many of the problems we have indicated in Table 3 could have been identified in advance, avoiding calamity in consequence.

Cost factor and energy contents

The heat energy contents of propane and butane are respectively 49.58 and 47.39 megajoules per kilogram (MJ/kg). However, the density of liquid propane and butane are 0.51 and 0.58 kilograms per litre (kg/L) respectively. That means due to the lower density of propane compared to butane, propane has a slightly lower energy content when based on volume (25.3 and 27.5 MJ/L respectively). Propane burns with a slightly higher flame temperature compared to butane (1980 vs 1970 oC). In certain gas burners, propane could burn with slightly higher efficiency compared to butane (with less deposition of carbon).

If calculated based on the heat energy content delivered (measured by BTU-British Thermal Units), propane is often a cheaper energy commodity compared to butane in the world energy market. Therefore, an LP gas mixture rich in propane can be cheaper. LP gases with more propane are also easier to procure. While per BTU price is cheaper, if calculated based on metric ton price, one can be misled to believe that propane is more expensive than butane. This becomes a false assumption if all gas pricing and market economics are based on the value of BTUs (energy) delivered to the customer (customer is made to pay for the heat energy content delivered to them, and not for the weight of the gas). Also note that the exact price of a certain LPG shipment can be very different from the typical spot prices prevailing in the world energy market.

Safety culture issue

Every organisation has a certain safety culture. Without going into detailed academic definitions of the safety culture concept, we can still try to understand different characteristics of good (positive) safety cultures in comparison to bad (negative) safety cultures.

In a good safety culture Management of Change protocols are always followed; when an accident or an incident occurs, it will always be investigated to the fullest extent and all lessons to be earned are extracted; transparency and honesty are always maintained; instead of finger pointing, their own faults are admitted; no attempts are made at concealing information; safety is always given priority over marginal economic gains. In contrast, the complete opposite of these is to be expected of an organisation with a negative safety culture.

Investigation and compensation

Any investigation into the recent series of unfortunate gas related accidents in Sri Lanka must not stop at merely identifying plausible physical causes. Such investigation must definitely look deeper into related organisational factors, and make necessary recommendations to bring about much needed organisational reforms in the form of enhancing safety culture. In addition, more systematic safety management requirements and stricter regulatory reforms must be recommended to avoid repetition of this kind of ‘organizationally rooted accidents’. Failing to do so may lead to greater disasters of higher magnitude in future. Prompt compensation to those who faced harm must be a priority. Even more urgent is to recall every single gas cylinder delivered with hazardous pressure conditions, irrespective of whether the gas has been used or not. As explained before, LP gas cylinders will retain the same high pressure condition until the last drop of liquid is vaporised. Therefore, unused as well as almost fully used gas cylinders will pose the same level of leaking hazard.

(Facts presented in this article are based on information available on the public domain. The analyses and opinions are based on the author’s experience in the industry, and do not reflect the opinions of any institution.)



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Dilemmas of ‘hurting economies’ – the case of Sri Lanka

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Dr. Ganeshan Wignaraja (right) and Ambassador (Retd) Ravinatha Aryasinha.

Maldives President Dr. Mohamed Muizzu was in Sri Lanka recently on what was apparently a goodwill visit and this event, no doubt, bodes very well for Maldives-Sri Lanka relations. Besides, the visit would go some distance in strengthening Sri Lanka’s claims to Non-Alignment.

However, the commentator on regional politics could be accused of simplistic thinking if he/she glosses over or ignores the regional politics nuances or undertones of the Maldivian President’s visit. In Sri Lanka we currently have a government which is eager to solidify its bridges, so to speak, with China and which, given the chance, would be courting increasingly close relations with Russia. In other words, the NPP government is likely to see itself as a ‘natural ally’ of the East and would prefer to distance itself to the extent possible from the West, if that is a realistic proposition.

Given the foregoing backdrop, it would be in some of the NPP regime’s best interests to be on cordial terms with the Maldives which is a close ally of China in the South Asian region. However, the NPP government, given the utter financial helplessness of Sri Lanka, cannot afford to distance itself politically and diplomatically from India and the West. Sheer economic necessity compels Sri Lanka to adopt this foreign policy stance. In other words, the latter has no choice but to be ‘Non-Aligned.’

This columnist was led to the above observations on listening to a lucid and comprehensive presentation titled, ‘A Global Economy in the Shadow of the Iran War and implications for Sri Lanka’s debt recovery’, by Dr. Ganeshan Wignaraja, Visiting Senior Fellow, ODI Global London, at the Regional Centre for Strategic Studies (RCSS), Colombo on May 4th. The forum, RCSS Strategic Dialogue – 4, was moderated and presided over by RCSS Executive Director Ambassador (retd) Ravinatha Aryasinha.

The forum brought together a wide cross section of society, including diplomatic personnel, academicians, public and private sector personalities and the media. After the presentation a very lively and informative Q&A followed.

Ambassador Aryasinha at the outset set an appropriate backdrop to the presentation and discussion by stressing ‘the increasing interconnectedness of geopolitical and economic developments, noting how disruptions in the Middle East could have significant ramifications for global markets, trade flows, energy prices and broader economic stability, including Sri Lanka.’

Indeed, there are occurring currently very disruptive economic and material consequences for the world from ‘the Iran War’, and with US-Iran hostilities spiraling in West Asia it may not be wrong to surmise that the worst could be yet to come, unless a peace process materializes in earnest.

Meanwhile, ‘hurting countries’ such as Sri Lanka would need to summon their best economic management capabilities to remain materially and economically afloat. ‘Economic transformation’ is what is urgently needed and not mere management and some of the insights thrown up by Dr. Ganeshan Wignaraja should have the local polity thinking.

There was the following observation, for instance: ‘Sri Lanka has achieved remarkable cyclical stabilization but faces critical challenges in transitioning to transformative growth, with 2027-2028 debt repayments looming and only $5.4 billion usable reserves.’

Needless to say, the path ahead to ‘transformative growth’ for Sri Lanka is strewn with multiple challenges and meeting them effectively is of the first importance. Sri Lanka must soldier on towards even a semblance of development in the short and medium terms and such initiatives cannot be separated from its foreign policy choices since the country’s economic partners and their growth prowess have a close bearing on the country’s material fortunes.

As mentioned, Sri Lanka will be compelled to be ‘a friend of all countries and an enemy of none’ going forward but it cannot afford to be seen as cultivating China as a close growth partner at the expense of India and other major economies of the region.

This is primarily because while India is remaining a major economic power, the current West Asian crisis notwithstanding, China’s economy is being seen as ‘slowing’. Dr. Wignaraja singled out the following in the main as the factors causing this slow-down: a bursting property bubble, increasing state regulation, and weakening investor confidence. Besides, the speaker sees production cycles moving away from China and India replacing China and Hong Kong as ‘manufacturing hubs’.

Accordingly, the NPP regime in Sri Lanka would need to craft its regional policy in particular with the utmost far-sightedness. It will need to have close economic links with all the growth centres that matter.

On the question of authentic economic transformation, the following observations of Dr. Wignaraja on Sri Lanka’s economy are of the first importance as well: ‘Foreign reserves are now at $ 5.4 billion, the cost of living is high, an estimated 20 per cent of the population lives below the poverty line of $ 3.65 per day, the recent cyber security breach at the Treasury would affect some 10 payments.’ These factors were termed ‘critical vulnerabilities’.

It is difficult to conceive of an economic transformation worthy of the phrase minus a steady economic empowerment of the populace. The above data point to the considerable magnitude of the local poverty problem. Right now, the disruptive effects of the West Asian crisis render swift poverty alleviation a most difficult proposition.

One possible way out of the present economic debacle is the forging of a national consensus by the present government on all outstanding problems that have been bedeviling the country’s advancement. That is, there needs to be a meeting of minds across current political divides. Considering the present inflammatory political polarities in Sri Lanka this would prove an insurmountable challenge.

Unfortunately, conscience-filled and civic minded sections in Sri Lanka have chosen to be laid back rather than seize the initiative, come centre stage and impress on politicians the need for enlightened governance and progressive change. There needs to be a historic coming together of the right thinking to ensure that the best interests of the people and of the people only are served by governments. In the absence of such a process, might would be projected as right and brute force would come to increasingly rule politics and society.

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Australia funds project to restore climate-resilient vegetable livelihoods in cyclone-affected highlands

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(L-R) D. P. Wickramasinghe, Secretary of Agriculture; Matthew Duckworth, Australian High Commissioner to Sri Lanka, K. D. Lal Kantha, Minister of Agriculture, Livestock, Lands and Irrigation, and Vimlendra Sharan, FAO Representative for Sri Lanka and the Maldives at the signing ceremony.

The Ministry of Agriculture, Livestock, Lands and Irrigation, the Government of Australia, and the Food and Agriculture Organization of the United Nations (FAO) have launched of a AUD 2 million (USD 1.4 million) recovery initiative to restore and transform vegetable production systems in the cyclone-affected districts of Nuwara Eliya and Badulla.

The FAO said yesterday (5) that the agreement was formalized through the signing of the grant agreement by Matthew Duckworth, Australian High Commissioner to Sri Lanka, and Vimlendra Sharan, FAO Representative for Sri Lanka and the Maldives, alongside the signing of the project document by D. P. Wickramasinghe, Secretary of Agriculture.

Cyclone Ditwah, which struck Sri Lanka in November 2025, caused widespread devastation across the country, severely disrupting agricultural production systems and livelihoods. The highland districts of Nuwara Eliya and Badulla, key suppliers of vegetables such as beans, carrots, leeks, cabbage, tomato and potato, were among the hardest hit, with thousands of smallholder farmers losing crops, seed stocks, and productive assets.

This 12-month initiative aims torestore and strengthen climate-resilient vegetable production systems, with a strong focus on empowering women farmers and supporting persons with disabilities. The project will directly benefit more than 2,400 smallholder farmers, through improved seed and seedling production systems, small machinery, training, and market linkages while indirectly supporting thousands more.

“This initiative is an important step not only in restoring what was lost, but in building a more resilient and self-reliant agricultural sector,” said Minister Lal Kantha. “By strengthening local seed systems and supporting smallholder farmers, particularly women and vulnerable groups, we are investing in the long-term sustainability of Sri Lanka’s food systems.”

“Australia stands alongside Sri Lanka in its ongoing recovery from Cyclone Ditwah,” said High Commissioner Duckworth. “Australia is a steadfast partner in the agriculture sector with its importance for food security, rural development and climate resilience. By focusing on climate smart practices, farmer-led solutions and inclusive economic opportunities, this project will deliver meaningful and lasting benefits to affected communities.

The project will prioritize the restoration of farmer-led seed systems for beans and potatoes, support the re-establishment of both open-field and protected cultivation systems and women led seedling supply nurseries while empowering all farmers with Climate-Smart Good Agricultural Practices (CSGAP) with small scale machinery and input support.

A key feature of the initiative is the establishment of six accessible and inclusive nurseries in Nuwara Eliya and Badulla. These nurseries will serve as sustainable agri-based enterprises, producing high-quality vegetable seedlings while creating new income opportunities and strengthening local input supply chains.

By combining recovery support with long-term resilience measures, the project will help stabilize vegetable production, improve household food security and nutrition, and reduce reliance on imported seeds.

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War on Iran may hasten unraveling of New World Order

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It took several decades for the US to realise it was losing the war in Vietnam. It took a bit shorter time in Afghanistan. And what is happening in the countries the US and Israel intervened and broke up? The US has been asked to leave Iraq. Syria is talking to Russia about establishing military bases, President al-Sharaa met with Vladimir Putin in Moscow to discuss the project, which is vital for Russian power projection in the Middle East. Libya has been divided into two competing administrative units with the Eastern section actively engaged with Russia in defence matters. The Sudanese government has finalised a 25-year deal to allow a Russian naval facility in the Red Sea in exchange for weapons, including anti-aircraft systems. On the Eastern side of the Red Sea, Yemen remains divided, with the main power center, the Houthis maintaining a staunchly anti-US, anti-Israel stance, while the internationally recognised government remains in exile.

When the Iranian Foreign Minister recently undertook a tour of Pakistan, Oman and Russia, the US wanted to meet him and got ready to send its negotiators Vice President J. D. Vance and his team to Pakistan, but Iranian FM snubbed them and left Pakistan, saying Iran did not want to talk to the US while a blockade of their ports were in place. The Iranian FM met President Putin, who congratulated Iran for courageously defending their country and then phoned US President Trump and told him further attacks on Iran would not be acceptable. During this conversation on April 27, 2026, Putin reportedly warned Trump that further U.S. or Israeli attacks on Iran would have dangerous consequences, according to Al Jazeera). Such a sequence of events would not have been possible in the unipolar world we had in the past.

Furthermore, the damage that Iran has inflicted on the US and Israel in this war would have been unimaginable in the late 20th Century and early 21st Century. Sixteen US military bases spread across Saudi Arabia, Qatar, UAE, Bahrain, Kuwait, Iraq, Jordan and Oman have been either destroyed or severely damaged. Advanced surveillance aircraft and radar systems worth more than $ 2.8 bn were destroyed. This had a far-reaching effect on the war as the US could not use these bases in the war against Iran and also in the defence of its allies in the Gulf.

The attacks on Israel have been equally damaging. In  Central Israel and Tel Aviv area multiple attacks targeted military and intelligence assets, resulting in massive damage. Iranian missiles hit the Haifa oil refinery, causing a shutdown, and hit residential buildings, leading to injuries and structural damage. Residential and commercial areas were damaged in Bat Yam and Petah Tikva with significant casualties and destruction. Attacks in Dimona and Arad targeted the Negev Nuclear Research Center, with casualties reported in both towns. The Soroka Medical Center in Beersheba was hit in a strike. The strategic port and naval base in Eilat were targeted. In Rishon LeZion suburban residential areas suffered extensive damage.

Usually, Israel makes short work of its many enemies in the region, for example it took just six days to defeat the combined military of Egypt, Jordan and Syria in 1967 and grab their land as well. Hamas, Fatah and Palestinians would suffer ignominious defeats if they dare challenge Israel. However, the recent war against Hamas, following a daring wide scale invasion into Israel by Hamas in October 2023, went on for more than two years with no conclusive victory for Israel.

These significant massive military setbacks suffered by the combined forces of the US and Israel have been made possible by the unprecedented advancement in military technology achieved mainly by China and to a degree by Russia as well. Iran has been able to develop ballistic missile systems that could penetrate the “iron dome” that Israel boasted, with technological assistance from China and North Korea. Iran’s drones are very cheap yet very effective, requiring interceptors worth millions of dollars to counter them, thus making it much more costly for the US to fight this war than it is for Iran.

Further, Hezbollah in Lebanon, Houthies in Yemen and Hamas in Palestine are well equipped with advanced missiles and drones. Hezbollah has been able to destroy about hundred Israel tanks and stop their advance. According to Larry Johnson, former CIA intelligence analyst, Israel soldiers are much war weary and mentally affected and are being withdrawn. Netanyahu’s 40 year dream of a “Greater Israel” is telling on the poor soldiers.

If a person like Barack Obama had been the US President instead of the hyper egoistic, blustering, intellectually barren Trump, things may have been different. An attempt would have been made to reconcile with the fact that the world is changing, instead of trying to stop it and make “America Great Again”.  Perhaps, it could be said that Trump is facilitating the emergence of the new world order by enabling the US citizens to see the reality, the futility of war and the fact that Israel is a liability because the US is fighting its war. Further, the war has enabled Iran to assert its place in the region and negotiate from a position of strength.

Perhaps, Israeli people may realise that the Palestine problem cannot be solved by militarily occupying their land, and that in a changing world a “Greater Israel” is a “pie in the sky”. They may have to agree to a two-state solution. US support may not always be forthcoming, certainly not at the level that Trump could extend, as this war is very unpopular and expensive. The other very significant fact is that Israeli settlers in the occupied lands feel insecure and one in three wants to leave and the numbers may grow when Palestinians and their sympathisers grow in strength in the new world order.

Moreover, the war on Iran has afforded China the opportunity to demonstrate with authority the fact that it stands for universal peace and does not tolerate illegal wars. Its message to the US conveyed its world view and its desire for peace in no uncertain terms. Trump cannot afford to disregard the Chinese position on the war on the eve of his visit to that country which may decide on future trade between the two countries as the US depends on China for several essential materials like rare earth minerals. Furthermore, China has shown that peace could be achieved by developing the economies of the underdeveloped countries irrespective of their alliances. It helps Iran as well as Saudi Arabia and try to build bridges between these foes. It welcomes Trump in the coming weeks and hopes to strengthen ties between the two countries despite the weaknesses of the latter.

Another important factor is the gradual decline of the critical value of the petro-dollar. Following the end of the gold standard in 1971, the US struck deals with Saudi Arabia and other OPEC nations (around 1974) to price oil exclusively in USD in exchange for military protection and arms sales. Dollars earned by selling oil came to be known as petro-dollar. Oil producers, holding large dollar surpluses, reinvest these funds in the US Treasury securities, real estate, and financial assets ensuring the recycling of petro-dollars. The system ensures a consistent global demand for US dollars, which helps fund the US budget deficit and maintains the currency’s dominance.

However, the petro-dollar system is on the decline and there are two main reasons for this, firstly the gradual rise of the new world order with organisations like BRICS, making a concerted effort to extricate from the dollar dominance by developing alternate currencies and methods to bypass the dollar. Secondly, the need felt by most countries to develop alternative energy sources to replace enormously harmful fossil fuel would eventually result in a decline in the demand for it and consequently the effectiveness of the petro-dollar. China is leading the world in both these endeavours; depolarisation process and renewable energy production. The war on Iran seems to have hastened the process of depolarisation as Iran insists that it will sell its oil for yuan only.

These revolutionary changes in the aftermath of the Iran war have their undeniable implications for the Global South, where more than 60% of the poor live.

by  N. A. de S. Amaratunga

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