no one can prove weather or not global warming is are fault or not, back in 74 we thought we were going into the next ice age, and now the earth is getting hotter, it coulde be the sun producing more heat, or us getting closer, or it could be greenhouse gasses, (not c02, as the earth has been producing that since the dawn of time, through forest fires, volcanoes and life forms decaying, infact we only produce about 3% of green house gasses)