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Over the past half-century, climate change has been blamed for heat waves, flooding, and rising seas. Now, researchers say warmer temperatures are widening the chasm separating richer and poorer countries, effectively boosting the economies of many wealthy polluters while dampening growth in much of the developing world. As a result, inequality between the haves and have-nots is already 25% greater than it would be in a cooler world, the paper asserts.
Though he disagrees about the numbers, University of California, Berkeley, economist Solomon Hsiang says the paper provides clear evidence that climate change has stunted economies in the developing world. “The study’s statement that warming should have already harmed economic opportunities in poor countries is extremely important,” he wrote in an email.
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The new work builds on previous research that found economic activity peaks at an average temperature of 13°C. Call it a “Goldilocks” condition that’s neither too hot nor too cold. Lower temperatures can hamper weather-dependent sectors like agriculture, but hotter temperatures can wither crops, sap workers’ energy, and exacerbate social conflicts. That study found that climate change could reduce overall global economic output by 23% by 2100.
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In the new study, the duo of climate scientist Noah Diffenbaugh and economist Marshall Burke, both at Stanford University in Palo Alto, California, used climate and economic models to tease out the economic impacts of climate change country by country, starting in 1961. Their model compared how each country performed in hotter and colder years, while accounting for other factors such as technological innovations and gyrations in the global economy. From each country’s response to temperatures, the modelers created two “worlds,” one reflecting actual...
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