Humans have learned over the years and have learned how to domesticate many plants and animals now we can have almost any type of food during any season. We started out hunters and gathers. Then we found out that we can domesticate plants and animals for farming after a while we started to do that a lot more(first agricultural revolution). Then the industrial revolution started now we have more people living in towns and cities than out at farms. The second agricultural revolution is when we started using tractors and power tools. Then finally the third revolution is where we started using GMOs and we have giant factories.