Scientific data show the atmosphere may be past a tipping point when it comes to global climate change, outgoing U.S. Secretary of State John Kerry said. With his tenure coming to an end, Kerry warned students and leaders at Massachusetts Institute of Technology of the dangers of climate change. By his account , sea levels are rising up to three times faster than they did during the previous century and storms like Hurricane Sandy that were once rare are more commonplace. “This is not some crazy coincidence,” he said. “This is actually what scientists have been warning us was going to happen for a long time.” […]