Quote: "No one knows for sure how long we've still got oil, but that is definitely not an excuse to not care about our future."
Oh yes, that's certainly true. I was just saying that as we move to more efficient means of using it, it'll likely draw out the demise of oil over a couple of decades or so.
Quote: "Fusion reactors have indeed been built - they just don't work very well."
Many of them have been test runs for different aspects of Fusion. Hottest plasma, best in:out ratio, longest sustained reaction, and various people champion various solutions from lasers to induction to even synchronised hammer strikes to fuse the Deuterium and Tritium together.
ITER is the endgame for all these tests, and hopefully it becomes the first reactor to put out a worthwhile amount more than the energy put into it.