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Pollution from a nearby dairy farm has caused algae to flourish on this mudflat.
Home Bay, Drakes Estero, Point Reyes NS, CA (1989).
It is important to keep soapy water well away from lakes and streams in alpine ecosystems.
near Upper Hamilton Lake, Sequoia NP, CA (1990).
Composting toilets are an efficient way of dealing with human waste in heavily-visited but remote areas.
Little Yosemite, near Nevada Falls, Yosemite NP, CA (1993).
By providing a privy the park service has concentrated all the human waste in one carefully selected spot.
Upper Hamilton Lake, Sequoia NP, CA (1990).
A simple outdoor toilet helps keep human waste away from the campsites and out of the streams.
Roaring Creek, Rocky Mountain NP, CO (1978).
On the crowded mesa top of the "Sky City" there was only one place for the privies.
San Esteban Church, Acoma, NM (1987).