Did you know....
There is a sustainable way of growing crop, one of the ways is Permaculture.
Permaculture is a system of agricultural and social design principles centered on simulating or directly utilizing the patterns and features observed in natural ecosystems.
The term Permaculture was coined by Bill Mollison and David Holmgren in 1968. Yes in 1968... That long ago... I honestly do not know why because its the only excuse for not gardening every week that my wife wholeheartedly accepts... Yes, our garden is Permaculture and I do not get any grief....;). All jokes aside its quite a relief gardening plant species that are so compatible, or better yet complementary. So a "Ph" rich vegetation is planted next to another which absorbs it, For instance a tomato next to rosemary.
The there is the concept of layers. Layers are one of the tools used to design functional ecosystems that are both sustainable and of direct benefit to humans. A mature ecosystem has a huge number of relationships between its component parts: trees, understory, ground cover, soil, fungi, insects, and animals. Because plants grow to different heights, a diverse community of life is able to grow in a relatively small space, as the vegetation occupies different layers. There are generally seven recognized layers in a food forest, although some practitioners also include fungi as an eighth layer. That of course is a whole other level but that said you don't need a large garden to get going with Permaculture. As for farming this would mean farms sell greater diversity crop without the burdensome single crop agriculture that currently burdens our environment so much.
Why not give it a try!