text:  One of the world's most grueling athletic endeavors is underway right now. The Tour de France began over the weekend under extremely hot conditions, which is a growing concern as climate change makes European summers hotter. Alejandra Barunda from NPR's Climate Desk is here to talk about the creative ways that riders are cooling down. Hi, Alejandra. Hey there, Elsa. Okay, so just how serious of a problem is heat in this race right now for the cyclists?