Environmental Impact of Future Colliders

<!--HTML-->We present the results of the Snowmass Implementation Task Force (ITF) analysis of 15 future collider concepts. We consider both the environmental cost of construction (CO2 footprint per meter of tunnel) and the carbon footprint associated with collider power consumption. We discuss strategies to mitigate the power consumption of future high-energy colliders, such as energy recovery. We also consider options to power colliders with renewable energy sources, and how to present a new collider as a benefit to society.