How Many Days Left on Earth??

I wonder how many folks paid any attention at all to a speech recently made by Stephen Hawking (spell?) He states, as a matter of fact, that humans have about 1,000 years left before they destroy the earth--in other words--start building those friggin space condos!! 
I'm sure plenty of people are thinking oh--poopy poop--wild speculation. But I for one, do not.
It is actually incredibly logical.
No matter how hard we try (as a few environmental activists have noticed)--the fight against global warming, resource or water conservation, becomes a fight against ourselves. No matter how well intentioned, all folks are not going to give up their luxuries , move into a solar yurt and bike to work... 
How do you fight the innate human desire for a more comfortable life?? There are billions of humans globally just waiting to have an American lifestyle--with fresh water, three bedroom homes, air conditioning, Old Navy disposable blue jeans and a hamburger at lunch time. But nobody wants to admit the math is not possible. The resources, the land , will run out. 

And the optimists shout--"but we'll have laboratory grown meat! And bamboo pants! solar cook stoves!!" But can you stop consumption? And if you had that magic wand--would anybody really want to stop the global economy? The human brain is wired to think (just like the animals) of their own survival first. Long term benefits for the masses --Not so much. There is a saying: there are plenty of fish in the sea. But I'm not so sure.....