He misses one other thing. What protects the Earth’s atmosphere is the Earth’s magnetic field, thanks to the spinning molten iron core. While Mars has a day similar to Earth’s, its core has solidified, thus its field is a mere remnant of what it likely was.
The resulting magnetosphere deflects much of the solar wind, which would otherwise ablate the atmosphere (as what likely happened with Mars).
Venus probably has a molten iron core, but does not rotate like Earth’s due to some tidal lock.
Good observation. I did not know Mars core had solidified. In fact it is amazing that we have so much iron in our core. The atomic fusion in stars begins with hydrogen fusing into helium. The fusion in stars keeps going with many atomic numbers fusing until it gets up to iron. When this point hits the gravity cannot hold the expansion and a star explodes into supernovae. So our earth and the iron core is likely from the debris of past stars.
“He misses one other thing.”
That NPR for you. Of course they are perfectly believable when it comes to “Global Warming”! /sarc