First, thanks for this excellent, informative, sobering, and provoking piece.

The most obvious remedy is to strongly reduce the huge waste of photosynthetically captured solar energy involved in animal-based food production, but the world’s ravenous appetite for meat is still moving us in the opposite direction.

Doesn't this argument assume that most of the land now used to grow feed could instead be used to grow food? I have always understood that animals raised to be food transform inexpensive things like grass that we cannot eat into something we can eat. Can a meaningful amount of those grasslands be better used as cabbage patches?

I don't believe that sharing is in the cards. Every species copes with scarcity by population control, a/k/a war. There is always a reason why the other guy is less deserving of land and water than we are. The people starving all over the world are evidence of that.