Decades of studied ignorance, political cowardice, cynical denialism and irresponsible dithering have allowed the problem to grow deeper and immeasurably harder to solve. But today, we are at an important turning point. The changing climate is no longer an abstract threat lurking in our distant future — it is upon us. We feel it. We see it. (…) And with that comes a new urgency, and a new opportunity, to act.