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Succinct descriptions of methane biodigesters and maps of those in California - solid site.
In the for-what-its-worth category, California is worth considering; here's a state where most of the food in the United STates is grown, one of the largest world economies in-and-of its own right, and they tend to be on or near the leading edge of renewable energy opportunities and sustainable business developments, as well as government regulations that touch on environmental issues. Not for nothing: what will it take for other states to take notice and follow suit? More on this pending to the blog area...