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On planet Earth the heat is rising – heat death zones to appear

Heatwaves to soar above the hot air of climate politics, Future generations will fear, rather than fend for, the global environment.Nature , 20 June 2017 “……… on planet Earth the heat is rising. Britain was hit by a heatwave at the weekend that forecasters say could last for weeks, and temperatures in California are predicted to reach record levels in a few days’ time. The world is cooking and we should anticipate more of the same.

From extreme rainfall to rising sea levels, global warming is expected to wreak havoc on human lives. Sometimes, the most straightforward impact — the warming itself — is overlooked. Yet heat kills. The body, after all, has evolved to work in a fairly narrow temperature range. Our sweat-based cooling mechanism is crude; beyond a certain combination of high temperature and humidity, it fails. To be outside and exposed to such an environment for any length of time soon becomes a death sentence.

And that environment is spreading. A death zone is creeping over the surface of Earth, gaining a little more ground each year. As an analysis published this week in Nature Climate Change shows, since 1980, these temporary hells on Earth have opened up hundreds of times to take life (C. Mora et al.Nature Clim. Change http://dx.doi.org/10.1038/nclimate3322; 2017). At present, roughly one-third of the world’s population lives for about three weeks a year under such conditions. If greenhouse-gas emissions continue to rise unchecked, that figure could climb, exposing almost three-quarters of the population by the end of the century.

The analysis also reveals that even aggressive reductions in emissions will lead the number of deadly heatwaves to soar in the coming decades. Cities including London, New York, Tokyo and Sydney have all seen citizens die from the effects of excessive heat. By 2100, people in the tropics could be living in these death zones for entire summers. It’s true that warmer winters will save lives further north. And those living in urban environments may find ways to adapt to the new norm of extreme heat. But, if the researchers are correct, the politics of Pruitt and those who try to hold him to account will seem quaint and anachronistic to our grandchildren. For they will live in a world in which most will see the environment less as something to protect, and more as something to protect themselves and their families from.http://www.nature.com/news/heatwaves-to-soar-above-the-hot-air-of-climate-politics-1.22164

June 21, 2017 - Posted by Christina Macpherson | 2 WORLD, climate change, health