The IPCC report is coming out tomorrow. As a climate scientist, I’d like you to know: I don’t have hope.
I have something better: certainty.
We know exactly what’s causing climate change. We can absolutely 1) avoid the worst and 2) build a better world in the process.
Tomorrow, if you live in a democracy, please call your representatives and tell them how much a livable climate matters to you. If you’re in the US, you can call the Senate at (202) 224-3121
Nov 13, 2020 • 6 tweets • 3 min read
I think we’ll be talking about climate a lot over the next few years. I started making a list of podcasts, websites, and other resources that I personally trust and learn from marvelclimate.com/#6
Including: @degreespod with the fab @leahstokes and @DrKWilkinson
Jul 22, 2020 • 7 tweets • 2 min read
FAQ on equilibrium climate sensitivity (ECS):
Q: If ECS is, say, 3C, does that mean we have no chance of avoiding the 1.5C or 2C targets?
A: No! ECS is the climate response to doubling CO2 from preindustrial levels (560ppm). We're at 416ppm now. We can stop before we get there!
Q: Why don't we know this number exactly?
A: As the planet warms, stuff changes- clouds, ice, water vapor, etc. And these changes "feed back" onto the temperature, speeding up or slowing down the warming. It's a very complex system!
May 15, 2019 • 12 tweets • 3 min read
What I’m going to tell Congress today: a thread
We’ve understood the physics of greenhouse gases since the 1820s, had experimental proof since the 1860s, and known ⬆️ CO2 = ⬆️ temperature since 1896 rsc.org/images/Arrheni…
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