A few facts from a geologist:
1) The earth is in a cold period and not in a so called greenhouse period
2) The oceans exhume 20x more CO2 per year than all human activity
3) 3 big volcano eruptions cause more CO2 emission than all human activity in a year
4) Sea levels, CO2 contents and temperature have varied widely in geologic history
5) The climate change debate started in England by nuclear lobbyists (Thatcher time)
Opinion:
Even though I´m very sceptic about climate change being caused by humans, it´s very good to change behaviour for humans, because the pollution is bad for our health and fossil fuels are getting more scarce.
EDIT: My 700th post! Nice to have it in a serious discussion.
EDIT2: kenzomatic has a nice graph that shows what I mean with some of my facts.
