Abstract Aerial Art/DigitalVision via Getty ImagesThe Invesco S&P Global Water Index ETF (NYSEARCA:CGW) is a passively managed exchange-traded fund designed to provide investors with exposure to companies that participate in water-related technology development and management. The strategy tracks the S&P Global Water Index, largely made up of large-cap constituents. CGW has $1.01b in assets under management (AUM) and charges an expense ratio of 59 bps. CGW was launched by Invesco on May 14, 2007, as a p ...