World leaders are scheduled to meet in Paris soon, trying to draft an agreement on how to combat climate change. Among the heads of state, you'll also see California Gov. Jerry Brown, who is spearheading his own international climate movement.
Brown has been on an international diplomatic tour the last few months — all about climate change.
"The world faces an existential threat," he told Canadian leaders in July.
Then, he went to the Vatican. "Whatsoever a man soweth, that shall he also reap," he said.