The Trump administration notified the United Nations Monday that it would withdraw the U.S. from the historic Paris climate agreement, starting a year-long process to leave the international pact to fight the climate crisis. The United States — the world’s largest historic greenhouse gas emitter — will become the only country outside the accord. Trump’s announcement of the withdrawal came on the first day possible under the agreement’s rules. From Middlebury, Vermont, we speak with Bill McKibben, co-founder of 350.org. “The decision of the United States to be the only country on Earth … unwilling to take part in a global attempt at a solution to the greatest crisis we’ve ever faced — there’s a lot to be ashamed of in the Trump years and a lot of terrible things that have happened — it’s pretty hard to top that,” says McKibben.