Local agriculture won't feed 7 billion people and even worst went the method you are proposing is GMO, fertilizer and pesticide free.
Also, there's plenty of evidence that small, sustainable farms are both more efficient (in inputs, and land) and more productive in total caloric terms that mono-cropped industrial farming. In the Pretty review I referenced, Table 3 shows the "adoption of agricultural sustainability technologies and practices on 286 projects in 47 countries" increased average % increase in crop yields from 22% to 146%. [2]
Per the FAO [3], globally, small farms continue to dominate in food production and their food production (and economic sustainability) would be improved via an "ecological intensification" approach. [4]
[1] https://www.wri.org/blog/2018/12/how-sustainably-feed-10-bil...
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2610163/
[3] https://www.globalagriculture.org/report-topics/industrial-a...