U.S. News: Republican front-runner Donald Trump has indicated he doesn't put much stock in man-made climate change. In the past, he tweeted that "global warming is a total, and very expensive, hoax!"
Meanwhile, Democratic candidate Hillary Clinton has said that as president, she would go after polluters and people in the U.S. and around the world "who don't recognize the seriousness of this crisis."
But while politicians continue to debate the existence of man-made climate change, the scientific community...