Am I the only one who thinks that anyone who can make a device that pulls "2,000 liters of water a day from the atmosphere, using completely renewable energy, for at most 2 cents a liter" would be far, far better to patent the machine and then sell it themselves? The device they are describing would be so miraculous - not to mention useful - that the $2 million prize would be small change to what the inventors would get if they commercialized it.
I mean, I'm all for encouraging scientists and don't think that science should only be about making money, but for what they are describing, they really ought to be offering a
I mean, I read that the cost of desalinization in California costs ~$10,000 per person (and that's just for the cost of the building plant, not the power or the distribution); to desalinate enough water for the whole state would cost close to $400 billion dollars. A machine that could create water for 5 people (2000 liters is a little more than 500 gallons; Americans use about 100 gallons of water a day) for $40 a day would have municipalities breaking down the inventor's door. XPrize really should offer remuneration that reflects the importance and value of the invention.