The following is something I posted on someone's Google+ thread. Long rant follows the break as it did not there.
100 years ago there weren't laws preventing you from using humanure to grow your food. And no-till agriculture is more efficient than that nonsense using rototillers and tractors and so on. Of course, it's only nonsense if you're only producing enough food for your own consumption; machines have their place in agriculture. I eagerly await further advances in robotics in agriculture, as that is the technology that makes it possible for economically feasible mechanized food production without destruction of the soil, water, air, et cetera. However, we have masses of unemployed in most of our societies worldwide, and such an advance would only exacerbate this problem. (long rant which followed deleted and moved to my blog)