And of course there is a lot of uranium that has not yet been mined. Price completely dismisses fusion. It is not currently practical, but has enormous potential. He says little about conservation. But as recently as two generations ago people lived using a lot less energy, and they can again.
Some new technologies can reduce energy use dramatically.
Consider information transmission, surely an important factor in the future. Years ago by kids on bikes, but more recently by cars. Today, people can post directly to a newsgroup or put information on a web page from their home, and anyone in the world can get it. More jobs are mostly processing information, and telecommuting can reduce commuting. etc. The resources of earth are limited.