I think the whole 'Greenhouse gases' are a load of rubbish personally. Us humans destroying the Ozone layer with our harmful vehicles.... Sure there has been scientific evidence to support such a case, but anyone remember that show Al Gore did about polution? I cant remember what it was called. All he went on about it how hardmful it is and how to make the earth greener, how about finding the root cause? How about minimizing the effects? How about running engines on veg oil, or dare I say, water? It isn't polution that is killing our planet, its the Humans natrual erge to kill and destroy anything and everthing for profit. Cutting down trees then building an almighty village or town in its place. Polution shoud be the least of our worries.