EcoWatch: Three very different men are uniting philanthropic efforts to form the Risky Business initiative, a new coalition that seeks to illustrate the impact of climate change on the U.S. economy. Risky Business is a joint venture between former hedge-fund manager turned activist Tom Steyer, New York Mayor Micheal Bloomberg and former U.S. Secretary of the Treasury Hank Paulson. Additional support was provided by the Skoll Global Threats Fund. In sectors across our economy--finance, health, agriculture,...