The one thing never to forget about global warming is that it’s a timed test.

It’s ignoble and dangerous to delay progress on any important issue, of course – if, in 2020, America continues to ignore the healthcare needs of many of its citizens, those people will sicken, die, go bankrupt. The damage will be very real. But that damage won’t make it harder, come 2021 or 2025 or 2030, to do the right thing about healthcare.

But the climate crisis doesn’t work like that. If we don’t solve it soon, we will never solve it, because we will pass a series of irrevocable tipping points – and we’re clearly now approaching those deadlines. You can tell because there’s half as much ice in the Arctic, and because forests catch fire with heartbreaking regularity and because we see record deluge. But the deadlines are not just impressionistic – they’re rooted in the latest science.

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