It’s official folks: El Niño is upon us. For some, that means get ready for an unseasonable deluge of rain; for others, things are about to get a lot dryer. And for a huge swathe of the world, the coming months are going to be scorching, as climate researchers warn about the potential for one of the hottest summers in the record books. Sure enough, the summer heat is already on our doorstep, broiling Tennis players at the French Open, killing of…