Poison ivy is poised to be one of the big winners of a warming world

Peter Barron pulls out poison ivy vines in Harvard, Mass. (Jesse Costa/WBUR)

Over a decade ago, when Peter Barron started removing poison ivy for a living, he decided to document his work.

"Every year I always take pictures of the poison ivy as it's blooming," said Barron, who is better known as Pesky Pete, of Pesky Pete's Poison Ivy Removal.