A Billion Tons of Coal a Year for 3000 years in Norway.

E M Smith
"The basic point is that there’s a heck of a lot of fossil fuels in the world. Loads of it. In 2005 they found 3000 billion tons of the stuff near Norway. Yes, it is under water and nearly impossible to mine at present. But technology changes. Whenever it is desirable enough, we can send small robotic mining machines down to get it."