Genetic engineering, organic agriculture and greenhouse gases

Tony Trewavas in PLoS Biology:

No-till farms produce only one third of the greenhouse gas emissions of an organic farm. No-till eliminates soil erosion and improves environment, wildlife, and soil. Most importantly, it maintains a conventional yield. Currently 10% of United States farms are totally no-till, and another 60% are partially no-till; this achievement is due almost solely to the availability of genetically-engineered herbicide-tolerant crops.