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Wet heat hits threshold in Chennai, urgent action needed


Express News Service
CHENNAI: Although Chennai’s daytime temperature breaches the 40 degree Celsius mark only for a few days in a year, the city is seen as one of the roughest places to live-in. The reason is humidity.  Researchers, who are decoding this phenomenon, are calling it ‘Wet Bulb Temperatures’ which is also called mugginess, or wet heat, in local parlance. In hot conditions, humans cool themselves by sweating; but if the humidity is too high, sweating no longer works, and we risk dangerous overheating. 
At wet bulb temperatures (WBT) of 32 degrees Celsius, even fit, acclimatised people can’t work; and at WBT of 35 degrees, even fit, acclimatised people who sit in the shade die within about 6 hours. Climate change is making these WBTs increasingly likely. In the 2015 Indian Heatwave, WBT in Andhra Pradesh reached 30 degrees. ....

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Keep warming under 1.5°C to stop tropics becoming too hot to live


VANDERLEI ALMEIDA/AFP via Getty Images
The tropics could become uninhabitable if we don’t limit global warming to less than 1.5°C, the target set in the Paris Agreement on climate change. Above this, the equatorial region, which is home to around 43 per cent of the world’s population, could see air temperatures increase beyond the limit that the human body can withstand.
Yi Zhang at Princeton University in New Jersey and her colleagues used data from 22 climate models to determine how rising air temperatures in the tropics will affect wet bulb temperatures – a measure of both heat and humidity made with a thermometer covered by a wet cloth. ....

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