Cause the climate is changing, the earth doesn't stay the same forever, 20000 years ago we had glaciers in the penines and wales, where have they gone? Maybe they melted because the sabre tooth tigers weren't eating enough woolly mamoths or maybe it was because the climate changed. If humans are so egotistical that they believe they can change things, they're living on another planet, or rather they should do. Yes, the scientists will put names to things and study things to the nth degree cos that's what they do, and the climate people will want everyone to abandon material goods and live on broad beans we grow in the garden, but nothing will actually change. All i know is that the plants and trees have gone mental this year and if that's due to the climate changing, there's going to be plenty of food in the future, we may even see banana trees in Leicester.