#AirPollution, measured by annual PM2.5--particles finer than a human hair--reduced in bigger cities such as Delhi & Varanasi but increased in smaller cities such as Fatehabad & Moradabad, finds a @CSEINDIA analysis of 26 cities. Follow the thread for insights:

Now, before the stupid conservatives begin sneering and laughing AGAIN about climate change and a massive snowstorm, one more time trying to educate:

A warming climate causes extreme weather events, *including* huge snow and plunging temps. 1 example why: (Note: I realize.../1

...that no matter what is said, anti-science and arrogant conservatives who failed high school science will still sneer and laugh because this is more complicated than "temp goes up, it gets cold. HAHAHA!" Plus, they don't wont read anything longer than 20 words. But this.../2

...will at least help reply to their foolishness.)

Here is what is happening right now: there is a large area of low pressure and cold air at both poles. That cycles around the poles and is contained there by higher pressure surrounding it. However, a warming planet changes.../3

...that. The higher pressure/low pressure contains the cold air, but as that warms, what essentially serves as a fence weakens. Plus, simultaneously, the warmer climate is changing the jet stream. Even before this, sometimes the contained area expanded and hit the jet stream.../4

...which brought the polar cold down, thus plunging temperatures. However, with a warming climate - because of the change in pressures and the moving jet steam - the polar air is coming down more frequently. A few years back, *Texas* was hit by polar air. That's how far down.../5

What were the big energy and climate surprises of the Trump era? Four years ago, I described the most plausible arc for US climate policy under Trump (it was a boring, safe bet) but expected there'd be unexpected developments too. So how about a look back? https://t.co/1Valz4eTEg

1) The pandemic was a huge surprise, obviously, though maybe it's too early to say how that will affect the energy/climate landscape. So far, it’s put a brake on U.S. fracking and induced Europe to pledge staggering sums on hydrogen. Maybe global CO2 emissions have peaked, idk.

2) The growth of battery storage on the US grid has, I think, been a surprise. This interview with @jburwen does a nice job of laying out the truly staggering changes in the storage landscape since 2015, driven by falling costs and some key policy changes.

3) The impact of the IPCC report on 1.5°C was surprising to me. I often wondered what'd happen once it became clear that the world was unlikely to stay below 2°C. Instead, the climate community and world leaders rallied around an even more aggressive, harder to hit target!

4) It was not obvious that Trump's retreat from climate action would spur states, cities, companies, other nations to make even more aggressive net zero pledges of their own. But that’s what happened—those pledges have really proliferated at a scale that’s been surprising to me.