Your so called "efficient farming" does increase the yield of calories per acre at the cost of killing of the microscopic ecosystems in the topsoil and bankrupting farmers. The only thing those practices are good at is to increase the margins of fertilizer and pesticide producers.
What bankrupt the farmers is that industrial farming does increase the yield of a given field at the cost of relying in an ever increasing and more advanced industrial inputs. This has the double effect of increasing both the fixed (machinery) and variable (GMO seeds, pesticides, fertilizers) costs, while at the same time increasing the offer and saturating demand. The farmers find themselves in the predicament to ever increase production just to survive on an ever decreasing margins. And when they can no longer afford the fancy inputs, the soil is already dead so they end up the proud owner of a wasteland and go belly up.
It would be hard to come up with sources for all of these assertions, specially in an informal debate, but for starters look at: http://www.joshuabradley.org/green_revolution/index.html
I am not saying that organic food is pointless - heck, I buy organic onions because they taste better and I buy organic milk and chicken meat because I vaguely care about how these animals are kept. But I do not subscribe to an idea that everyone absolutely has to eat organic food. It is not only non-essential, but I think it might actually be impossible.
Edit: Found the research: http://www.bbc.co.uk/news/health-19465692
30% less likely to contain pesticides is a nice positive benefit.
Actually, I would see it the other way round, on one condition. If people had a guaranteed income (or housing, healthcare & food) then paying humans to do work that robots can do would seem like an unnecessary luxury to me.