Keep warming under 1.5°C to stop tropics becoming too hot to live Read more: https://www.newscientist.com/article/2270357-keep-warming-under-1-5c-to-stop-tropics-becoming-too-hot-to-live/#ixzz6oegu5Ct9

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. Read more: https://www.newscientist.com/article/2270357-keep-warming-under-1-5c-to-stop-tropics-becoming-too-hot-to-live/#ixzz6oeh2vkyu

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. “One can think of this wetted thermometer bulb as mimicking the process of human skin cooling off by evaporating sweat – this is why it is relevant for the heat stress of our bodies,” says Zhang. Humans’ ability to regulate an optimum body temperature of 37°C is dependent on this. If the wet bulb temperature exceeds 35°C, the human body is unable to sufficiently cool itself down. Read more: https://www.newscientist.com/article/2270357-keep-warming-under-1-5c-to-stop-tropics-becoming-too-hot-to-live/#ixzz6oehJLhmz