Fahad Saeed is a climate impact scientist for Climate Analytics, based in Islamabad, and Bill Hare is CEO and senior scientist at Climate Analytics.
Pakistan’s southern province of Sindh has been sweltering under 52°C heat in recent days. Not in the news however is that wet-bulb temperatures in the region – a more accurate indicator of risk to human health that accounts for heat and humidity – passed a key danger threshold of 30°C.
Climate change is increasing the risk of deadly humid heat in developing countries like Pakistan, Mexico and India, and without international support to adapt, vulnerable communities could face catastrophe.
What is wet-bulb temperature?
Wet-bulb temperature is an important scientific heat stress metric that accounts for both heat and humidity. When it’s both hot and humid, sweating – the body’s main way of cooling – becomes less effective as there’s too much moisture in the air. This can limit our ability to maintain a core temperature of 37°C – something we all must do to survive.
A recent study suggests that wet-bulb temperatures beyond 30°C pose severe risks to human health, but the hard physiological limit comes at prolonged exposure (about 6-8 hours) to wet-bulb temperatures of 35°C. At this point, people can experience heat strokes, organ failure, and in extreme cases, even death.
Climate change and deadly heat
Globally, around 30% of people are exposed to lethal humid heat. This could reach as much as 50% by 2100 due to global warming. To date, the climate has warmed around 1.3°C as a result of human activity, primarily due to the burning of fossil fuels. And along with the extra heat, with every 1°C rise the air can hold up to 7% more moisture.
A comprehensive evaluation of global weather station data reveals that the frequency of extreme humid heat has more than doubled since 1979, with several wet-bulb exceedances of 31-33°C. Another recent study predicts a surge in the frequency and geographic spread of extreme heat events, even at 1.5°C warming.
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What this shows is that the humid tropics including monsoon belts are all careening towards the 35°C threshold, which is very worrying for countries like Pakistan. The city of Jacobabad has already breached 35°C wet bulb temperatures many times. More areas of the country are likely to be exposed to such life-threatening conditions more often due to climate change.
At 1.5°C of warming, much of South Asia, large parts Sahelian Africa, inland Latin America and northern Australia could be subject to at least one day per year of lethal heat. If the world gets to 3°C, this exposure explodes, covering most of South Asia, large parts of Eastern China and Southeast Asia, much of central and west Africa, most of Latin America and Australia and significant parts of the southeastern USA and the Gulf of Mexico.
Areas of the world that will experience at least one day of deadly heat per year at different levels of warming
Source: ScienceAdvances
Even at 1.5°C of warming, there will be high exposure to lethal heat in large regions where billions presently live. This terrible threat to human life calls for urgent action to limit warming and help at risk communities adapt.
Adapting to hard limits
While 35°C can prove deadly, one study suggests a 32°C wet-bulb threshold as the hard limit for labour. More realistic, human-centred models found this overly optimistic, as direct exposure and other vulnerability factors were ignored. Vulnerable groups including unskilled labourers would be most at risk of losing their income.
In densely populated urban centres, lethal humid heat is not just a future projection but a current reality. This calls for urgent adaptation measures which integrate the risk of deadly heat into urban planning, public health, early-warning systems and emergency response.
Investments in green spaces, heat-resilient buildings and urban cooling are vital adaptation strategies. Community initiatives like awareness campaigns, indigenous cooling strategies and local heat action plans are also essential. Households could consider investing in cooling technologies or migrating – options mostly available to the wealthy.
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As climate change makes lethal humid heat a growing threat in some of the world’s most populous areas, more attention must be paid to understanding its risks – especially in vulnerable regions with huge data gaps. This demands a multidimensional response that combines scientific research, policymaking and community engagement.
The potential scale and level of risk to human life also reinforces the importance of ensuring that the Paris Agreement’s 1.5°C global warming limit is met. To do this, we need to halve emissions by 2030. Countries should therefore strengthen their 2030 emissions targets in line with the warming limit as they prepare equally ambitious 2035 targets in updated NDCs.
The Pakistan heatwave is a terrible reminder of this often-underestimated threat. We must act now to limit warming while we adapt to the growing danger of deadly heat if we are to avoid potentially wide-reaching tragedies in the future.
The post Developing countries need support adapting to deadly heat appeared first on Climate Home News.
Climate Change
‘This is a fossil fuel crisis’, Greenpeace tells Senate gas tax Inquiry, citing homegrown renewables as path to energy security
CANBERRA, Tuesday 21 April 2026 — Greenpeace Australia Pacific has slammed gas corporation war profiteering and environmental damage in a scathing Senate hearing today as part of the Select Committee on the Taxation of Gas Resources, urging fair taxation of gas corporations and the transition to secure, homegrown renewable energy to protect Australian households and the economy from future energy shocks.
Speaking at the hearing, Greenpeace said the US and Israel’s illegal war on Iran has laid bare the fundamental flaws of an energy system built on fossil fuel extraction, geopolitical power plays and corporate greed, and will be a defining moment for how the world thinks about energy security.
Greenpeace’s submission and full opening remarks can be found here.
Joe Rafalowicz, Head of Climate and Energy at Greenpeace Australia Pacific, said:
“This is not an energy crisis, it’s a fossil fuel crisis. The crisis we’re all facing lays bare the dangers of fossil fuel dependence, for our energy security, our communities, and for global peace and stability.
“Gas corporations like Woodside, Santos, Shell and Chevron — the same companies whose CEOs refused to front this Inquiry — are making obscene war profits, using the illegal war on Iran to price gouge, profiteer and push for more gas we don’t need — while people and our environment pay the price.
“Australians are getting smashed by soaring bills and the impacts of climate disasters — gas corporations should be paying their fair share to help this country, instead of sending billions offshore, tax-free.
“But we’re at a turning point — while gas corporations cynically push to open up more of our oceans and land to drilling for fossil fuels, our allies like the UK are doubling down on renewables in response to the fossil fuel crisis. Our trading partners in Asia are making the same reassessment of fossil fuels.
“Which is why the hearing today is crucial: an effective and well-designed tax on the gas industry’s obscene war time profits is a chance to channel funds to people and communities, fast-track the rollout of clean, secure homegrown wind and solar energy, while holding polluters accountable.
“Our dependence on fossil fuels leave us overexposed to the whims of tyrants like Trump — it’s in Australia’s national interest to end the fossil fuel chokehold for good and usher in the era of clean energy security.”
-ENDS-
Media contact
Kate O’Callaghan on 0406 231 892 or kate.ocallaghan@greenpeace.org
HOW WOODSIDE’S BROWSE GAS PROPOSAL THREATENS SCOTT REEF’S GREEN TURTLES AND PYGMY BLUE WHALES
Woodside’s Browse to NWS gas project is under assessment by the WA and Federal Governments right now. This is a project that involved drilling up to 50 gas wells around Scott Reef off the coast of WA. Gas would be extracted directly underneath Scott Reef and Sandy Islet and pumped through a 900-kilometre subsea pipeline to the NWS gas processing facility.
Woodside’s Browse gas project’s impact on Scott Reef’s marine habitats?
Scott Reef is one of Australia’s most ecologically significant marine environments, where green turtles breed, pygmy blue whales feed, and an array of at-risk species, including sharks, dolphins, whale sharks, rays, sawfish and sea snakes thrive. It is home to many threatened species, including some found nowhere else on Earth or in genetically isolated groups, magnifying its importance from a conservation perspective.
This delicate reef’s ecosystem faces multiple threats if Woodside’s Proposed Project goes ahead, including seismic blasting, gas flaring, noise pollution, artificial lighting, pipe laying and fast-moving vessels. The reef also faces the risk of a gas well blowout, which could have catastrophic and irreversible consequences for the region’s reefs and marine parks.
Woodside’s woeful marine impacts management plan
To secure their approvals, Woodside had to develop a plan for how they would manage the significant risks to threatened green turtles and endangered pygmy blue whales if the project proceeds. We’ve had two independent scientists provide a technical assessment of Woodsides management plan for whales and turtles and their findings are gobsmacking.
Their assessment found that Woodsides management plans for these species misrepresents or does not assess the risks the Browse project poses to Scott Reef’s pygmy blue whales and green turtles. They’ve also surmised that if the project goes ahead the impacts contradict the Australian government’s own recovery plan for turtles and Conservation Management Plan (CMP) for Blue Whales.
The State and Federal Governments now have the opportunity to define their legacies on nature protection and save Scott Reef from Woodside’s dirty gas.
Technical Assessment of Woodside’s Browse Pygmy Blue Whale Management Plan
Prepared for Greenpeace Australia Pacific by Dr Ben Fitzpatrick of Oceanwise Australia with Dr Olaf Meynecke of Griffith University.
The full technical assessment is available HERE
Scott Reef is a vital feeding, foraging and resting habitat for pygmy blue whales.
Pygmy blue whales feed, forage and rest in the Scott Reef region every year. Scott Reef is recognised as a Biologically Important Area for the pygmy blue whale and is an important stop-over on their annual migration.
Woodside’s Browse gas project could delay or prevent the population recovery of the endangered pygmy blue whales that rely on Scott Reef, heightening their extinction risk.
- Woodside’s management plan claims of “no credible threat of significant impacts” are not supported by scientific evidence.
- The management plan relies on outdated whale population information.
- Woodside has claimed it is unclear whether Scott Reef is a foraging habitat for pygmy blue whales, despite the presence of pygmy blue whales and significant concentrations of krill being documented in the area.
- The PBWMP ignores the impacts of industrial noise on whale-to-whale communication. This is especially concerning as mother-calf pairs migrate through the Scott Reef Biologically Important Area shortly after calves are born. Mother-calf pairs rely on continuous, uninterrupted communications to maintain their connection.
Woodside’s Browse gas project could delay or prevent the population recovery of the endangered pygmy blue whales that rely on Scott Reef, heightening their extinction risk.
Technical Assessment of Woodside’s Browse Turtle Management Plan
Prepared for Greenpeace Australia Pacific by Dr Ben Fitzpatrick of Oceanwise Australia.
The full technical assessment is available HERE
Scott Reef is a vital nesting ground for unique green turtles.
The green turtles that nest at Scott Reef’s low-lying Sandy Islet sand cay and nearby Browse Island are genetically unique and are classified as ‘Extremely Vulnerable’ in Australia’s Recovery Plan for Marine Turtles.
Woodside’s Browse gas project could make Scott Reef’s unique green turtles extinct.
- The Browse project would operate within 20 kilometres of nesting habitat that’s critical to the survival of Scott Reef’s genetically unique and vulnerable green turtle population.
- Woodside’s Browse Turtle Management Plan (TMP) misrepresents the risks the Browse project poses to Scott Reef’s green turtles.
- Claims in Woodside’s TMP about Scott Reef’s green turtle population size, nesting success and hatchling numbers are not backed by scientific evidence.
- The TMP proposes gathering updated data after the Browse project is approved.
- Woodside’s TMP proposes adding sand sourced elsewhere to Sandy Islet to counter subsidence and erosion, but fails to properly assess the associated risks.
To save Scott Reef and protect our oceans and animals, the State and Federal Governments must reject Browse.
Technical Assessment of Woodside’s Browse Pygmy Blue Whale Management Plan
To secure their approvals, Woodside had to develop a plan for how they would manage the significant risks to threatened green turtles if the project proceeds. We’ve had two independent scientists provide a technical assessment of Woodside’s management plan for whales and turtles and their findings are gobsmacking.
Woodside’s Browse gas project could make Scott Reef’s unique green turtles extinct.
Woodside’s Browse gas project could delay or prevent the population recovery of the endangered pygmy blue whales that rely on Scott Reef, heightening their extinction risk.
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