Night—time in europe and the us is not expected to bring widespread relief either, as temperatures stay above 30 celsius or 86 fahrenheit in places including arizona and southern spain. georgina rannard from the bbc climate unit explains why scientists are worried about these temperatures. it has been days now of sweltering temperatures across the us, europe, and china, and one millions of people have struggled through this extreme heat, climate scientists have been poring over a run of broken climate records. they say the speed and the timing that these records have tumbled is unprecedented...