Uh...

Venus has a gravity of 0.904g, which is the closest to Earth gravity you'll find. The main problems are the fact that atmospheric pressure is 90 times greater than that of Earth, the fact that the surface is hot enough to melt Lead due to the intense atmosphere, and the complete absence of water.

Atmospheric pressure is largely due to greenhouse gases, which can be relieved along with a fair portion of the heat issue (as they're largely the same problem) via a Solar Shade, to cool the planet to where a lot of the gas could fall to the surface as Dry Ice to be shipped elsewhere (perhaps to Mars, where the problem is not enough atmosphere). Water could possibly be mined from an Ice Moon of Saturn such as Europa and literally just bombard Venus with large chunks of ice.

That's all pretty offtopic (and the info is available at http://en.wikipedia.org/wiki/Terraforming_of_Venus), I'm mainly interested in the ethical ramifications.