As we know about global warming , how many of you have heard of global dimming? As you may well guess, it's all to do with the pollution effects of sunlight over the whole world, particularly in places like south east asia where there is a hell of a lot of coal burning and eccesive factories burning toxins. The worst culprit of all is probably high altitude aircraft. In some places around the world the sunlight has fallen by 20% due to all this crap in the atmosphere. This has also accounted for drought back in the eighties in Africa as rainfall has plummeted. It goes show just what global warming is doing and the balance must be restored.