Reuters: On Monday, the Obama administration will release new rules regulating carbon pollution from existing U.S. power plants that run on fossil fuels like coal and natural gas, a linchpin of his plans to tackle climate change. Following are some key moments in President Barack Obama's efforts to address climate change: PUSH FOR CAP-AND-TRADE After campaigning on a promise to make the United States a global leader on climate issues, Obama pledged in his first inaugural address in January 2009 to "harness...