Actually, I don't mind put my hand up and telling you I'm one of those sceptics. I've read many articles about it that quite simply made me question whether, or not, it actually happened.
I mean sure it's recorded as an historic event with pictures and such but a lot people, who are a whole lot smarter than me, have put some pretty convincing arguements forward that suggest is was just a giant hoax.
So, I think I prefer to keep an open mind on that one.
And, global warming I agree with Oz, I think I know gobal warming is a fact, but I don't feel certain that it's man-made greenhouse gases that are causing it. Therefor, I'm not certain how urgent, or helpful, is it s that people and goverments take action to reverse carbon emissions.
Again, I've read excellent arguments and again by people who know a whole lot more about it than I do, who say the slight global temperature change detected by scientists is part of a cyclical pattern and more to do with the sun's activities than anything happening on Earth.