Update, 3/30/2019: Sen. Ed Markey (D-MA) and Rep. Alexandria Ocasio-Cortez (D-NY) introduced a Green New Deal resolution on February 7 that lays out the goals, aspirations, and specifics of the program in a more definitive way. Read about it here, and read about the criticism that followed here and here. The Senate voted the resolution down on March 26, but Ocasio-Cortez is now drafting a series of smaller, related bills. Our initial explainer, first published on December 21, follows.
If the recent report from the Intergovernmental Panel on Climate Change is to be believed, humanity has just over a decade to get carbon emissions under control before catastrophic climate change impacts become unavoidable.
The Republican Party generally ignores or denies that problem. But the Democratic Party claims to accept and understand it.