How can we be sure that global warming (climate change) is a fact?

[Glenna BECK]

How is it possible to prove that humans are causing climate change when there can be no study about the earth without human impact?

 

[Just Asking]

good point! Maybe that's why we should err on the side of caution

 

[Obama the retarded clown]

Democrat's believe Al Gore. That's enough evidence for their small minds.

 

[20090120!]

no , we just have a 90% certainty that it is a fact.

Edit. I am just curious , so you think the only right study is with or without humans prsent ? I presume we would miss a lot of scientific achievements if we wouldhave taken your pass.