While Venus' atmosphere is worth study, due to the theory that it underwent some sort of hyperactive climate change a few billion years ago, there are limits to the comparison:

- Venus is about 3/4 the distance from the Sun as Earth.

- Venus has slow, retrograde rotation that leaves a given portion of the surface exposed to the Sun for 56 Earth days at a time.

- Venus has no magnetic field, which causes the loss of water vapor and other light gases due to the solar wind