We convert fuel into people. As the author states, "It’s so blindingly obvious that I am embarrassed to have belabored the point as long as I have."

To slow population growth anyway educate young women and provide them seed capital.

A new person in the U.S. uses far more resources than a new person born in China or India, so the U.S. population growth has a far greater effect than they do despite their greater growth rate. (A good reason not to have children if you live in the U.S., as the author has chosen not to do.)

In the final section titled "Oil-Clouded Crystal Ball" the author ignores fusion. The word "fusion" appears nowhere in the article.

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EDIT:

What's with the fusion hate y'all?

First: Dr. Bussard on fusion: $200M and done: https://www.youtube.com/watch?v=rk6z1vP4Eo8

And THE SUN: A fusion reactor that will burn out your eyes from 150 Giga-meters away.

We're going to have plenty of ergs for the foreseeable future. Heat pollution will be an issue before the deuterium runs out.

I don't like to be vulgar in public but hating on fusion power is just stupid.