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Water ETFs are available for trading and investing to gain direct exposure to this growing and scarce global resource.  Investing in water ETFs can be speculative and volatile due to the limited basket of underlying companies that make up most of these funds.  Investing in clean water ETFs are an investment play on global warming continuing and the supply/demand balance of clean water throughout the globe continuing to erode due to pollution, population growth and global warming.  Clean water technologies may have a significant future upside, but it could take a long time for these investments to become commercially viable and adopted into mainstream economies.   Here is a comprehensive list of water ETFs available for etf investing:

Water Exchange Traded Funds

Claymore S&P Global Water Index ETF (CGW)
First Trust ISE Water Index Fund (FIW)
Global Water Portfolio (PIO)
Powershares Water Resources Portfolio (PHO)
Claymore S&P Global Water ETF (CWW-TSX)