Okay so according to your bottom source there is not centuries of fossil energy left. There isnt even a century of oil, unless you want to move to Iraq.
Your naturalgas.org link features this report…which I already read a while back.
Check out the chart on page 112. So what happens 75 years from now? Keep in mind it is based on 2005 consumption. I am sure that will go down, right? Lol.
In addition it states right on their home page there is no way to accurately determine how much nat gas is left. If you are going to quote a source you might want to read it first.
Your coal link states 250 years. I am sure that will still be 250 years once all the oil and nat gas dries up.
The good news is you and I can just be selfish and not worry about it…none of this will happen in our lifetimes.