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The term cleantech therefore tends to be a more amorphous industry group than, say, environmental services, and a less rigid investment asset class than, say, financial services.Sectors that appear to fit into the definition of cleantech without dispute include:Renewable energy – wind, solar thermal and photovoltaics, wave, tidal, hydro, geothermal, biomass and biogas;Water technologies that increase efficiency;Energy efficiency, green buildings and biomaterials;Waste management and recycling;Energy storage and fuel cell technologies;Low emission vehicle technologies; andEnvironmental Services

In the United States, bottled water outsells both milk and beer. And if projections about the bottled water industry prove correct, within four years it will surpass soft drinks, the only beverage category that stands in its way to the top. Considering that clean tap water in the West is widely available for next to nothing, the bottled water industry has tracked a remarkable journey over the last 30 years to the point where it is worth $US60 billion ($62 billion) a year, says author Elizabeth Royte, who has investigated its global ascent.