We already know how to get off of fossil fuels. We know how to make solar panels, nuclear reactors, electric cars, electric heat pumps, etc. The technology exists. It will likely continue to improve, but we could do it entirely with what already exists.

If we deploy it by the time today's unborn children become a significant fraction of the global carbon footprint, it isn't going to matter how many of them there are. And if we don't deploy it by the time today's unborn children become a significant fraction of the global carbon footprint, it isn't going to matter how many of them there are.