Heat Waves Hit the Poor Hardest
By Mojtaba Sadegh, John Abatzoglou, Mohammad Reza Alizadeh 24 October, 2022
Heatwaves are among the deadliest disasters and poorer countries will be 2-5x more exposed to them by 2060, which risks $ billions. Sadegh, Abatzoglou & Alizadeh share more key findings from their research
This article is republished from The Conversation (under a Creative Commons license). Read the original article, “Heat waves hit the poor hardest – a new study calculates the rising impact on those least able to adapt to the warming climate”, published on 10 February 2022 here.
Spend time in a developing country during a heat wave and it quickly becomes clear why poorer nations face some of the greatest risks from climate change. Most homes don’t have air conditioning, and even health clinics can get overheated.
Poorer countries will be 2-5x more exposed to heatwaves by 2060
In a new study, our team of climate scientists, economists and engineers found that the poorest parts of the world are likely to be two to five times more exposed to heat waves than richer countries by the 2060s. By the end of the century, the lowest-income quarter of the global population’s heat exposure will almost match that of the entire rest of the world.
Capacity to adapt to rising heat is crucial
Heat waves are often assessed by how frequent or intense they are, but vulnerability involves more than that.
A key factor in the amount of harm heat waves cause is people’s capacity to adapt with measures like cooling technology and the power to run it.
Wealthy countries can buffer risks by investing in climate adaptation
To assess how heat wave exposure is changing, we analyzed heat waves around the world over the past 40 years and then used climate models to project ahead. Importantly, we also incorporated estimates of countries’ ability to adapt to rising temperatures and lower their heat exposure risk.
We found that while wealthy countries can buffer their risk by rapidly investing in measures to adapt to climate change, the poorest quarter of the world – areas likely to be slower to adapt – will face escalating heat risk.
Poverty slows the ability to adapt to rising heat
Heat waves are among the deadliest climate and weather-related disasters, and they can be destructive to crops, livestock and infrastructure. Currently, about 30% of the global population lives in areas where heat and humidity levels can be deadly on at least 20 days a year, studies show, and the risk is rising.
Heatwaves are among the deadliest climate & weather-related disasters…
…already 30% of the world live in deadly heat & humidity levels at least 20 days/ year
Adaptation measures, such as cooling centers, home-cooling technology, urban planning and designs focused on reducing heat, can lower a population’s heat exposure impact. However, a country’s ability to implement adaptation measures generally depends on its financial resources, governance, culture and knowledge. Poverty affects each. Many developing countries struggle to provide basic services let alone protections from escalating disasters in a warmer future.
The compounding effects of economic, institutional and political factors cause a lag in low-income countries’ ability to adapt to the changing climate.
Poorest quarter of the world lags the wealthiest in adapting to heat by 15 years
We estimate that the poorest quarter of the world lags the wealthiest in adapting to rising temperatures by about 15 years on average. This estimate is based on the pace of preparation and support for adaptation plans described in the U.N. Environment Program’s Adaptation Gap Report. The actual lag will vary because of wealth inequities, but that estimate provides a broad picture of the rising risks.
Heat risk is up globally, but more in poor regions
Looking back over recent decades, we found a 60% increase in heat wave days in the 2010s compared with the 1980s. We defined a heat wave as extreme daily temperatures above the 97th percentile for the area, for at least three consecutive days.
We also found that heat wave seasons were getting longer, with more frequent early- and late-season heat waves that can increase heat-related deaths.
60% increase in heat wave days in 2010 compared to 1980s & seasons are getting longer
Our analysis showed that people’s average heat wave exposure in the poorest quarter of the world during the 2010s was more than 40% greater than in the wealthiest quarter – roughly 2.4 billion person-days of heat wave exposure per year compared with 1.7 billion. A person-day is the number of people exposed to the heat wave times the number of days.
By the 2030s, we project that the lowest-income quarter of the world’s population will face 12.3 billion person-days of heat wave exposure, compared with 15.3 billion for the rest of the world combined.
By the 2090s, we estimated it will reach 19.8 billion person-days of heat wave exposure in the poorest quarter, almost as much heat wave exposure as the three higher-income quarters together.
Climate justice and future needs
The results provide more evidence that investing in adaptation worldwide will be crucial to avoid climate-driven human disasters.
The world’s wealthiest nations, which have produced the lion’s share of greenhouse gases driving climate change, promised over a decade ago to direct US$100 billion annually by 2020 to help the poor countries adapt to climate change and mitigate its effects. Some of that money is flowing, but wealthy countries haven’t met the goal yet.
International assistance is key as economic loss in developing countries could reach $580bn/ year by 2030
Increasing international assistance can help poorer countries adapt to the harm caused by climate change. Companies and innovators can also play an important role by developing low-cost microgrid electricity and cooling technology to help poor countries survive escalating heat waves.
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