If your internal pressure is less, it will crush you.

This is turn will lower the pressure of the atmo as heavier elements begin to settle out.

Don't say gravity, that's the wrong answer.

Venus: Magnetic field and core
The weak magnetosphere around Venus means the solar wind is interacting directly with the outer atmosphere of the planet. Here, ions of hydrogen and oxygen are being created by the dissociation of neutral molecules from ultraviolet radiation. The solar wind then supplies energy that gives some of these ions sufficient velocity to escape the planet's gravity field. This erosion process results in a steady loss of low-mass hydrogen, helium, and oxygen ions, while higher-mass molecules, such as carbon dioxide, are more likely to be retained. Atmospheric erosion by the solar wind most probably led to the loss of most of the planet's water during the first billion years after it formed. The erosion has increased the ratio of higher-mass deuterium to lower-mass hydrogen in the upper atmosphere by a multiple of 150 times the ratio in the lower atmosphere.

Originally posted by spacedoubt
reply to post by 12 stranded dna

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Are the Venetians Blind? I mean from being so close to the Sun and all?

I've though about Venus too, as a potential Habitable planet. But there is that Rotation problem...The Day is longer than it's year. Seems just spinning it up, might offer some benefits...I know "Just" spinning it up...like it's a simple thing to do.
Since it's rotation is opposite of the Earth, and slower...How would one go about increasing the speed?