A measure that Senate Democratic leaders plan to unveil on Tuesday would establish a reduction of greenhouse gas emissions of 2 percent each year through 2025. Credit Kristina Barker for The New York Times WASHINGTON — Senate Democratic leaders on Tuesday plan to unveil a measure intended to signal their full-throated support of President Obama ’s aggressive climate change agenda to 2016 voters and to the rest of the world. The Democrats hope that the bill, sponsored by Senator Maria Cantwell, of Washington, the top Democrat on the Senate Energy Committee, will demonstrate a new unity for the party on energy and climate change, and define Democrats’ approach to global warming policy in the coming years. The measure would establish as United States policy a reduction of greenhouse gas emissions by 2 percent each year through 2025 — a cut even […]