Ah, a particular bug bear of mine - the continued reference to global warming and how it will be the end of the earth, its all mans fault and the entire planet is doomed as a consequence.
Sure, I agree there is global warming. Is it man made? Almost certainly man hastened, but man made is more debatable. There have been 7 mass extinctions in earths history, wiping out over 95% of all known life. Think of the dinosaurs (which is the one everyone can relate to). That is a global catastrophe, the polar ice caps melting is mere inconvenience in comparison. Since we are coming out of the last ice age still (which is why we have ice caps at all) global warming is simply part of the Earths natural cycle.
Man has hastened a natural event, and now we have realised, switching off a few lights, adding a wind turbine and driving an eco car is not going to make a jot of difference. Notice how destruction of the ozone layer doesnt get much of a mention nowadays? Thats a man made problem but people do not relate to it - they like their fridges and TVs. Sadly most of the hype over global warming is commercially driven - getting people to pay more for 'green' goods (organic farming is a classic example).
A far bigger issue than global warming is petrol availability - petrol may run out in your lifetime (or be so expensive and difficult to extract it amounts to the same thing) but global warming is not going to fry you or put you under 50 feet of water. For that reason and that reason alone the effect of greener cars and alterative fuels is a good thing.
Steve.