Photo: NASA/The LIFE Picture Collection via Getty Images

For once, the climate news might be better than you thought. It’s certainly better than I’ve thought.

You may not have noticed it, amid the flood of bad news about the “Emissions Gap” and the collapse of the COP25 climate conference in Madrid, but over the last few weeks a new narrative about the climate future has emerged, on balance encouraging, at least to an alarmist like me. It is this: As best as we can understand and project the medium- and long-term trajectories of energy use and emissions, the window of possible climate futures is probably narrowing, with both the most optimistic scenarios and the most pessimistic ones seeming, now, less likely.

That narrowing contains both good and bad news — what was recently the best to hope for now seems vanishingly unlikely, and what…