One day after the Islamic State group killed or injured about 500 people in a series of attacks in Paris, Sen. Bernie Sanders, I-Vt., linked climate change to the spread of terrorist groups overseas. At the second Democratic presidential debate, held Saturday in Des Moines, Iowa, Sanders was asked whether he stood by his previous claims that climate change was the No. 1 threat to national security. He said he did."Climate change is directly related to the rise of global terrorism," Sanders said, adding that it would cause nations to start "struggling over limited amounts of water, limited amounts...