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With stingy, risk-averse customers, it's tough to commercialize new water purification technologies. Start-ups are focusing on a niche to get a foothold.
You can live without electricity, but not water or food. A crop of new companies are trying to take the chemistry out of agriculture and eliminate crop pests and microbes the natural way.
People will be leaving Las Vegas in droves if Lake Mead runs dry in a few years.
Quos wants to take seawater and turn it into drinking water cheaply.