How 1.5 degrees became the key to climate progress
Bill McKibben writes: It’s Earth Day +51, as we near the end of President Biden’s first hundred days, and forty world leaders are scheduled to join him for a virtual summit on climate change. “For those of you who are excited about climate, we will have a lot more to say next week,” the White House press secretary, Jen Psaki, said last Thursday, which is a sweet way to think about it—better than “for those of you who are existentially…