Stephen said "100 years"..

What can't we do in 100 years? Think about where we were 100 years ago and where we are now... The massive advancements we made! Why wouldn't we be able to invent an easy solution to the heating of the Earth problem?
Ofcourse it won't be easy to invent an easy solution, but I'm quite sure 100 years is enough for us to think of one and actually do it!
 
"And if we don't succeed?" Ofcourse there exists the possibility of us not succeeding in saving the planet.. That means we have to get an other planet. We can go to a planet just like Earth through a Wormhole and save us all!