Agriculture is experiencing radical changes. Farmers are learning to produce crops without tilling the soil, robots are becoming farmhands, and companies are raising crops without sunlight or soil. Though these changes are revolutionary, some believe we have not gone far enough. While pesticides allow farmers to prevent soil erosion, some argue agroecological methods can prevent erosion without pesticides, through the use of polycultures, green manures, and other techniques used in organic agriculture. Livestock agriculture is also being challenged on animal welfare and environmental grounds, so much so that some individuals conduct undercover investigations of livestock farms, and companies are investing large amounts of money to create meat substitutes. The possibilities afforded by genetic engineering are enormous, and while some see the technology as a key component of sustainability, others see it as a threat. While individuals may share similar goals for improving the food system, their preferred methods often differ.