Huffington Post: Three of the candidates in the 2016 presidential race have pledged to shun campaign contributions from the fossil fuel industry. Democratic candidates Bernie Sanders and Martin O'Malley and Green Party candidate Jill Stein have agreed to a pledge from The Nation magazine that states: "In the name of protecting our country and the world from the growing dangers of climate change, I will neither solicit nor accept campaign contributions from any oil, gas, or coal company." The Nation called on candidates...