If we gave up meat, we could be much more efficient. Meat is an extremely inefficient way to grow food. However, as it stands today the growth in farming output is not keeping up with population. Farming today also is completely dependent on fossil fuels for fertilizer, pesticide, and equipment. The high yield strains of crops that are absolutely necessary to feed the world’s population will not grow unless covered in pesticide, fertilizer, irrigated and so on.
As fossil fuels become more expensive and eventually run out, people in the poorer parts of the world will be screwed. There are also increasing issues with the availability of water.
We really need a technological breakthrough in farming technology of the magnitude of the Green Revolution to keep up.
And Westerners can sustain our wealthy lifestyle only to a point, China and India’s middle class is growing and so is the demand for fossil fuels. Unless we make some big technological developments, we’re likely all going to feel it, not just the poor nations. Well, saying this assuming you’re young. If you’re old and on your way out, you probably won’t feel it.