So is the largest contributor to the problem just lack of land? Seems like most of the other problems from the article can be solved with money, but a lack of land makes it hard to build anything

I once calculated that if we reduce the land use for livestock by 50% and then use 10% of the newly freed land to build housing (the other 40% can become nature), we can build a city something like 1.5x times the size of Amsterdam, the largest city in the Netherlands.

It’s not a lack of land. It’s how the land is being used. Almost half is for livestock (or more accurate: to dump the shit of that livestock, as the majority of the animals is kept indoors).

So less food, more people? Have you heard the term “famine” before?