Advances in biotechnology have led to development and commercialization of several herbicide-resistant crops (HRCs) in the mid-1990s. The first reported case of herbicide resistance in the US was reported in the 1950's. Field bindweed resistant to 2,4-D was reported in Kansas in 1964, and common groundsel resistant to triazine herbicides was discovered in Washington in 1970. Both transgenic (created through stable integration of a foreign gene) and non-transgenic (developed through traditional plant breeding) HRCs are commercially available to farmers. Cultivating herbicide resistant crops promotes, and significantly increases, herbicide use, forcing farmers onto a chemical treadmill – with ever increasing quantities of herbicides necessary to maintain their crops. Development of herbicide-resistant crops has resulted in significant changes to agronomic practices, one of which is the adoption of effective, simple, low-risk, crop-production systems with less dependency on tillage and lower energy requirements and to present the environmental impacts of herbicide-resistant crops. Farmers who have chosen HRCs must have seen some economic and weed control benefits.