In the U.S. there are now several natural waste water treatment facilities, notably one in Arcata, California. Flush Toilet, Goodbye - The design of a composting toilet. Mayan Rainforest Farming - Example of successful rainforest agriculture. Rammed Earth Construction - Beautiful samples of rammed earth construction. Short Rotation Forestry - Coppicing for maximum yield wood lots.
Artificial wetlands purify waste water.
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