Efficiency and Tenacity are two of the reasons the human race hasn't gone extinct already

Mostly it depends upon a few people never giving up no matter what and learning to be more and more efficient at everything useful that they do over time. Then these efficiencies are taught to the next generation and then they do the same. The next generations are born and then they do the same.

The only problem with this equation is that when every generation is this efficient eventually there is no room on the planet for more people.

So, as you can see Global Climate change is sure to thin us all out.

Until we learn to manage the weather ourselves.

And then at some point we really will have to get a handle on overpopulation or it's all over for us as a human race here on earth.