We are making whom suffer? The animals? And your solution to this is to kill them instead? How about we protect them as well as we can, while trying to counter the effects of Global Warming through different energy sources with less toxic by-product. Global Warming is a gradual process and thus in a hundred years we might actually see a decline in the temperature or an increase. Global Cooling might suddenly activate to counter the increase of temperature instead. We shouldn't wipe out a species because they might feel uncomfortable, as they might adapt quickly.