Temperatures in 499 counties across west, northeast and upper midwest US have already breached 1.5C (2.7F)
More than a third of the American population is currently experiencing rapid, above-average rates of temperature increase, with 499 counties already breaching 1.5C (2.7F) of heating, a Guardian review of climate data shows.
The US as a whole has heated up over the past century due to the release of planet-warming gases from burning fossil fuels, and swathes of the US west, northeast and upper midwest – representing more than 124.6 million people – have recorded soaring increases since federal government temperature records began in 1895.