The news coming from North America over the last two weeks has been increasingly dark. Mother Nature is not happy. Bill McKibben writes:
That one long screed of news from one continent in one week (which could be written about many other continents and many other weeks – just check out the recent flooding in south Asia for instance) is a precise, pixelated portrait of a heating world. Because we have burned so much oil and gas and coal, we have put huge clouds of CO2 and methane in the air; because the structure of those molecules traps heat the planet has warmed; because the planet has warmed we can get heavier rainfalls, stronger winds, drier forests and fields. It’s not mysterious, not in any way. It’s not a run of bad luck. It’s not Donald Trump (though he’s obviously not helping). It’s not hellfire sent to punish us. It’s physics.
People have been ignoring the physics of climate change the way they used to ignore the link between smoking and cancer. But now:
Hurricanes Harvey and Irma are the equivalent of one of those transient ischaemic attacks – yeah, your face is drooping oddly on the left, but you can continue. Maybe. If you start taking your pills, eating right, exercising, getting your act together.
That’s the stage we’re at now – not the warning on the side of the pack, but the hacking cough that brings up blood. But what happens if you keep smoking? You get worse, till past a certain point you’re not continuing. We’ve increased the temperature of the Earth a little more than 1C so far, which has been enough extra heat to account for the horrors we’re currently witnessing. And with the momentum built into the system, we’re going to go somewhere near 2C, no matter what we do. That will be considerably worse than where we are now, but maybe it will be expensively endurable.
The problem is, our current business-as-usual trajectory takes us to a world that’s about 3.5C warmer. That is to say, even if we kept the promises we made at Paris (which Trump has already, of course, repudiated) we’re going to build a planet so hot that we can’t have civilisations.
In other words, this is the moment when we either do something to halt climate change -- or we perish.