WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America. Portables Drivers operate heavy-duty vacuum trucks and are responsible for providing delivery, pick-up, pumping, and cleaning services for portable toilets, sinks, and holding tanks.