SAN FRANCISCO (Reuters) - Clean technology is evolving from environmental issue to big business, opening a world of opportunities for companies, entrepreneurs and investors who see a chance to -- yes -- clean up, says a new book.

"Clean technology is everywhere," write Ron Pernick and Clint Wilder in "The Clean Tech Revolution: The Next Big Growth and Investment Opportunity" (Collins, $26.95).

They describe clean tech as "any product, service, or process that delivers value using limited or zero nonrenewable resources and/or creates significantly less waste than conventional offerings."
The main force pushing clean tech from "utopian dreams" to new Silicon Valleys and Wall Street is simple economics: "Clean-energy costs are falling as the costs of fossil fuel energy are going up," the authors write.

http://news.yahoo.com/s/nm/20070804/bs_nm/us_books_cleantech_dc_1