To assess risk from heat, scientists use the 'wet bulb temperature,' looking at the point where the human body isn't able to let enough heat out.
Many countries have seen extremely hot weather lately, but in most of the inhabited world, it's never going to get"too hot for people to live here," especially in relatively dry climates.
In parts of the Middle East, Pakistan and India, summer heat waves can combine with humid air that blows in off the sea, and this combination can be truly deadly. Hundreds of millions of people live in those regions, most without access to indoor air conditioning. Is it climate change?When people burn carbon — whether it's coal in a power plant or gasoline in a vehicle — it creates carbon dioxide . This invisible gas builds up in the atmosphere and traps the sun's warmth near the Earth's surface.
Every bit of coal, oil or gas that ever gets burned adds a little bit more to the temperature. As temperatures rise, dangerously hot and humid weather has begun to spread to more places. All of these impacts mean that climate change threatens the global economy. Continuing to burn coal, oil and gas could cut global incomes by about 25% by the end of the century, according to one estimate.The bad news is that as long as we keep burning carbon, it will continue to get hotter and hotter.
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