It is now unclear to me whether donating to HIPF from CEARCH is beneficial or harmful due to the possibility of their grants increasing food consumption.
I have now estimated funding HIPF increases agricultural land 78.5 % as cost-effectively as I had calculated due to increasing calorie consumption. This is a minor change, so I maintain my recommendation of funding HIPF. I also confirmed that taxing beef decreases agricultural land. I estimated that consuming unprocessed red meat in the US increases agricultural land 1.72 k times as much as it decreases it from reducing life expectancy.
Nevermind.