Keeping cool saves thousands of lives yearly, but at a cost of worsening global warming, experts say

Cooling from air conditioning saves lives — more than 5,000 a year in the US alone — but it also heats up the planet and taxes our electrical grid, scientists say.As the world warms, heat waves strike nearly every continent and UN officials estimate that about half a million people die a year from heat, air conditioning is needed and being used more than ever. A study in Nature Health reported Monday that air conditioning saved nearly 58,000 lives between 2010 and 2020 in the US Air conditioning use is skyrocketing around the world, with electricity demand from cooling expected to triple, according to the International Energy Agency and the United Nations Environment Programme.It’s also more of a problem than ever. Because most of the electricity for cooling comes from the burning of fossil fuels, the UN projects the amount of heat-trapping gas spewed into the atmosphere from air conditioning use to rise from 4.5 billion to 7.2 billion tons in the next 25 years or so. That 7.2 billion tons is almost as much as the carbon pollution from the United States and Europe now.