An extract from the World Naked Bike Ride book:
Running your car in an enclosed space, such as a garage, will surely kill you in a very short period of time. It is not so very difficult to extrapolate this fact to the much larger natural environment of the atmosphere layer which we inhabit on this Earth - our one and only, and extremely thin, habitation zone in the entire known universe. It's like pouring poisonous chemicals into the sea and expecting that because it looks pretty big: we'll never see those pollutants again, there will be no pay-back. This is an insular, immature, child-like view of our world. The planet, fortunately for us so far, has a lot of space with which to diffuse these deadly exhaust fumes and poisons, but it is by definition not infinite and we are affecting our environment with all of our effluent, one way or another. We and our children will live and die with the result of our pollution, whether we choose to ignore it or not.