32.9 MB (2.6 MB compressed)
2762 x 4159 pixels
23.4 x 35.3 cm ⏐ 9.2 x 13.9 in (300dpi)
NANCY J. PIERCE / SCIENCE PHOTO LIBRARY NANCY J. PIERCE / SCIENCE PHOTO LIBRARY
A paddlewheel turns processed municipal solid waste at the Prairieland Composting Facility in Minnesota. The first step towards making compost, biological decay, is accomplished here in the siloda building. Any pathogens in the waste are killed by the heat generated during decomposition.
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