How hard would it really be to create a food economy based on their needs?

With literally all the world’s expertise at their disposal, no politics, and unlimited cooperation, how hard would it really be to create a food economy based on their needs.

I’m not an agriculture person, but could could envision:

1. Breed a ton of animals with short lifespans and regularly harvest those with natural death (eg, guinea pigs, chickens, mice).
2. Breed a ton of animals who lay eggs (chickens, quail, ostriches, etc) who also could be used as protein on natural death.
3. Breed those who can be milked (goats, cows, etc) and those who produce other natural food items (eg, bees)
4. Cultivate trees and plants where monitoring and harvesting naturally fallen fruit would be easy (oranges, apples, pecans, etc)

If you were highly motivated it feels like you could build a global food economy around these items in relatively short order that would be sustainable. But maybe I’m underestimating the task. You could also migrate people to the regions where these food sources would thrive and be most plentiful. It’s an interesting thought experiment.