The two words “climate” and “change” are so routinely strung together that just saying them as a pair—“climate change”—seems to somehow obscure the full weight of the phenomenon they describe, to say nothing of its consequences. But in those moments when one pauses to consider the ramifications of human activity on the planet for generations and generations ahead, things can feel beyond bleak. And yet: This past year saw the nations of the world reached their first-ever agreement on an ambitious plan to rein in emissions, perhaps the most significant progress yet made on this issue.
We reached out to some of the leading scholars of climate change, conservation, and ecology, and asked them what, as the Earth begins yet another trip around the sun, is giving them cause for hope and despair. Below are their answers, lightly edited for length and clarity.