Here is how much Summers in the U.S. have warmed since 1970

Here’s How Much U.S. Summers Have Warmed Since 1970 (via Climate Central)

By Brian Kahn Follow @blkahn June is here, so let the great debate over the Song of the Summer begin! Will this summer’s earworm come from a pop stalwart like Katy Perry or a newcomer like Iggy Azalea? Radio and Spotify listeners around the country…