There are alternatives: Agroforestry, silvopasture, permaculture. Diverse agricultural systems that lean on natural processes. It would mean a diet of more plants, less animals. But frankly, meat is far too cheap. None of the externalities are priced in.
I stopped eating meat years ago, but still eat fish on occasion. I would rather pay $100 for sushi, than live in a world with no fish.
Africa and West Asia is the sole source of this increase. We need an urgent program to strip away food aid and replace it completely with education for women, family planning, and incentives for sterilisation and not having any or only one child.
Additionally the West needs to disallow all immigration and refugee settlement from poor countries. We should not provide a pressure release valve for overpopulation, nor harvest the few human resources that would otherwise help develop and modernise these countries.
I would rather have millions of insect, plant and animal species still alive than billions of excess humans clinging to life via destructive subsistence agriculture.
Letting a small number of people die of hunger is not going to change that equation. In fact it may have the opposite effect.
And food aid is a small minority of all aid. Long term programs to build local capability are already the vast majority of money spent.
Its simpler than that. Women in many parts of the world have no agency, and no access to contraception. Change those two things (this should be the REAL battle of feminists) and you will go a long way to solving overpopulation.
Before global trade, wealthy countries became wealthy through population growth. Today most every wealthy country has low or negative native birth rates, depending on immigration to shore up their economy. Japan's lost decade is an example of negative birth rates along with no immigration.
Something we haven’t considered?
Also simply ban the worst of them, like DDT.