Some things to think about re Fermi's paradox. Life should be all over the galaxy, let alone the universe. So, where the heck is everybody?

Well, maybe, on any Earth type planet, If there is insufficient stored carbon available, the species will not be able to develop a technologically advanced society due to insufficient energy for the development of enough complexity. But if there is sufficient stored carbon available, the species will inevitably destroy itself.

It's just thermodynamics, innit. 

http://www.paulchefurka.ca/Fermi.html