After food prices rose, partly due to extreme weather that destroyed crops, the US changed its farming laws to subsidize production instead of non-production. Now the US is dumping cheap food around the world. That is good for some of the world's poor, since they can afford food, but bad for those who are farmers.

With a large harvest, farmers suffer from low prices. With a small harvest, prices go up and poor people go hungry. A good economic system for farming would need to avoid both problems. Meanwhile, we are using up topsoil around the world so a good economic system for farming needs to protect the soil. I fear that putting marginal land into agricultural use seems likely to damage it.

In the medium term, a few decades, agriculture faces many threats.

We will need a tax on meat to discourage people from eating so much of it.