So it's daytime is shorter; does that mean the seas of lead freeze on the night side? I'm only a layman, but it seems like the amount of heat retained and reflected should be about the same whether the half of the surface getting sunlight is the same or varies. Naturally differences between various places on the planet should vary a lot more, but if there's a big difference between the total heat retained by a spinning versus motionless planet I'm curious to know why.

Additional questions:

Is a magnetic field thought to play a role in the greenhouse effect, or did you just mention it to give an example of a difference between Earth and her sister planet?

Twice as much light, really? I didn't think they were THAT much closer to the sun.

I'm not saying we're identical though, just that Venus provides us an excellent example of how a runaway greenhouse effect really can have dire consequences, despite the claims of those who insist it doesn't matter even if it IS happening here. Too much of that, hell, too much of US policy in general these days, strike me as a rationalized excuse to do nothing, with the incidental effect that those who materially benefit from doing nothing continue doing so. And accuse reputable scientists of bias and greed.