JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Landfill site. The green pipes are injecting material collected from septic tanks into the landfill site. This system speeds the decay of organic waste, accelerating the recovery of methane gas. The methane, which is a powerful greenhouse gas, is used to generate electricity for distribution to homes. Photographed in Smith's Creek, Michigan, USA.
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