Excellent post - there is a lot to discuss on this, and if we're all adopting a scientific approach, we're all open to persuasion should compelling evidence be presented.
So, as this arose on the Snow Tomorrow thread, and to avoid that one becoming flooded with Climate Change debate, here we are.
So, where do YOU stand on this? (Poll to follow)
Do you beleive that human activity is altering the chemistry of our atmosphere to such an extent that it is changing...