An interesting recent discussion about whether it would be easier to terraform Venus or Mars - http://www.slate.com/blogs/quora/2013/09/12/outer_space_can_we_ma

An interesting recent discussion about whether it would be easier to terraform Venus or Mars - http://www.slate.com/blogs/quora/2013/09/12/outer_space_can_we_make_mars_or_venus_habitable.html http://www.slate.com/blogs/quora/2013/09/12/outer_space_can_... (full conversation from Quora, but linking to Slate because, well, Quora.)