But aren't we at the end off the small ice age? And is global warming really something we can prevent, or is it part off the normal warming and cooling cycles off the earth? I sometimes wonder if all the effort we do is in vain.
That difference is the eradication of much of life on earth that is unable to evolve to a new environment. For example, insect numbers worldwide are drastically lower than decades ago, and insects are required for almost all pollination of plants and a key source of food for small animals. The "food chain" collapses if there is no first chain.
Even a partial loss of ecodiversity can lead to further problems later.
Our efforts are certainly not in vain.