Climate: 'dangerous heat' could afflict billions by 2100

Earth's surface temperature is on track to rise 2.7 degrees Celsius above preindustrial levels by 2100, pushing more than two billion people -- 22 percent of projected global population -- well outside the climate comfort zone that has allowed our species to thrive for millennia, the scientists reported in Nature Sustainability.

Capping global warming at the 2015 Paris climate treaty target of 1.5C would sharply reduce the number of those at risk to less than half-a-billion, some five percent of the 9.5 billion people likely to inhabit the planet six or seven decades from now, according to the findings. "For every 0.1C of warming above present levels, about 140 million more people will be exposed to dangerous heat."The threshold for "dangerous heat" used in the new findings is a mean annual temperature of 29C.

Sustained high temperatures at or beyond that threshold, studies have shown, are strongly linked to greater mortality, reduced labour productivity and crop yields, along with more conflict and infectious disease.That number has today increased five-fold, and will climb ever more steeply in coming decades, the study found.

Source: Energy Industry News (energyindustrynews.net)

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