We need to go back to sustainable i.e organic agriculture -- it works with the cycle of life, and improves the soil over time, and help the soil hold water and build it up rather than erode. Chemical fertilizers and pesticides and mono cultures and factory farming are depleting the soil and the aquifers quickly, and erosion and runoff is causing dead zones, and adds about 25% of the greenhouse gases in the form of nitrous oxide. Water soluble nitrogen runs off -- about 80% of it; and combines with oxygen. The natural organic process forms fixed nitrogen, which does not run off in the first place.
But, I think we will need to keep things like the Internet, and modern medicine, etc. So, we need to stop doing the unsustainable things, but keep the stuff that is truly valuable.
Dirt! The Movie