Bill McKibben in The New Yorker:

Political reality is always important, but in this case there’s something more crucial—call it just plain reality. It dictates that every step we take from here on pay heed to the underlying science, above all to the shrinking time we have left to make any real difference. After thirty years of standing still, baby steps won’t do us a bit of good, and a misstep may cost us our last chance.