The document summarizes a study comparing the environmental impacts and life cycle costs of synthetic turf fields versus natural grass fields over 20 years. The study found that the energy use, raw materials use, greenhouse gas emissions, and air emissions of synthetic fields were generally comparable to natural grass fields with 300-432 hours of annual availability. For grass fields with lower availability, environmental impacts could be up to 2.5 times higher than synthetic fields. Overall, a natural grass field would need about 420 hours of annual availability to have equal environmental impacts to synthetic turf. The life cycle costs of natural grass fields were approximately 1.5 times higher than synthetic fields over 20 years.