I remember reading that the earth is still in an ice age... hence all the ice everywhere, so yes there will always be a "global warming" because the world will heat up, however the rate at which it would normally heat up has been offset by humans. I however think that all this global warming hoopla is overstated, the earth knows what its doing, it will balance itself out, the worse thing that will happen is there will be catastrophic environmental effects that wipe out humans and the earth will reset itself. (There is an article floating around the net on what earth would be like if all humans vanished, pretty interesting read, in a million years or so the only distuingishable artifacts that would prove we existed would be bronze statues, lol)