Climate change has already started. And it will cause more severe issues than what we might tend to think of. It might be the reason for us to go extinct along with many other species. And the world as we know today will surely see its end in the next two decades max if we still live the way we live. And I am not joking.
But the point you made is very valid."if we still live the way we live" It should not take more than few yrs to see extinction.