This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration. It was mid-afternoon when first responders found David Spell slumped and unresponsive under a bus shelter. The temperature outside was nearing 110F (43C)—the hottest day of the year so far in Phoenix, and 50-year-old Spell was disorientated, dizzy and dehydrated. Spell had felt hot and weary during his shift at a car auction after driving an old Buick without air conditioning, but couldn’t take a break.