Farming for an ever growing population.
https://www.eurekalert.org/news-releases/917471
A global shift towards healthy and more plant-based diets, halving food loss and waste, and improving farming practices and technologies are required to feed 10 billion people sustainably by 2050, a new study finds.
We don't need to feed more, we just need to bring the education and standard of living if the world up. And maybe figure out how to make the people in developed countries to have sustainable birth rate...