BBC: More than 3 billion could live in extreme heat by 2070

Tek

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More than three billion people will be living in places with "near un-liveable" temperatures by 2070, according to a new study.

Unless greenhouse gas emissions fall, large numbers of people will experience average temperatures hotter than 29C.

This is considered outside the climate "niche" in which humans have thrived for the past 6,000 years.

Co-author of the study Tim Lenton told the BBC: "The study hopefully puts climate change in a more human terms".


"We show that for thousands of years, humans have concentrated in a surprisingly narrow subset of Earth’s available climates, characterized by mean annual temperatures around ∼13 °C. This distribution likely reflects a human temperature niche related to fundamental constraints. We demonstrate that depending on scenarios of population growth and warming, over the coming 50 y, 1 to 3 billion people are projected to be left outside the climate conditions that have served humanity well over the past 6,000 y. Absent climate mitigation or migration, a substantial part of humanity will be exposed to mean annual temperatures warmer than nearly anywhere today."

 

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