#5689
Breakable
Keymaster

There seems to be some clear explanations about what cycles earth goes trough (not very relevant to radiation Venus though)
http://www.youtube.com/watch?v=hWJeqgG3Tl8
While the channel itself speaks from the GW defender perspective it seems to contain accurate information and simple explanations. I think I will spend some time studying it:
http://www.youtube.com/user/greenman3610

Edit: for example did you know that more co2 does not necessary mean more plant growth?