We balance on a knife edge between estreme possibilities.

If we can pull ourselves together, get a handle on our population growth and solve our environmental problems before the world is consumed by starvation, disease and war, our future could be glorious.

But I think it is equally possible that we will not solve those problems in time and will destroy ourselves, and the world will be ruled by bacteria and fungus.

Then the bacteria and fungus will fight, and only fungus will survive.