Who would have thought in 2007 to see this now?

Some points on the "Oh, but natural gas leaks" response.
1. Yes, US natgas suffers significant CH₄ leaks. But in contrast to coal CO₂ emissions, and CH₄ leaks from coal mines, most CH₄ leaks from gas infrastructure CAN be plugged, and would be if regulation were in place.

2. Methane is a short-lived greenhouse gas. If regulation forced the leaks to be plugged, the warming effect of that already-leaked methane would disappear much more quickly than the hundreds of years that CO₂ from coal combustion would remain in the atmosphere.

3. Moreover, gas-fired stations are much more time-flexible than coal, providing the space for wind and solar to grow and thrive. With renewables prices continuing to drop, the gas share should follow. This is a critical transition.

Also note that 2020 is special, because of the pandemic: reduced electricity demand has hit coal hardest because it's the most expensive generation source. US coal consumption is expected to bounce back again in 2021 before continuing its decline.

And by asking 'Who would have thought', I in no way suggest that no-one at all hoped, imagined or expected this. Big changes can happen.