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Another potential drawback to the warm, sunny and calm conditions will be the build up of pollutants in the atmosphere.

One oft-cited drawback of its marketing plan is that customers only have to submit their saliva once, which works against repeat business.

Noland is a powerful demonstration of the tech's potential to change lives - but there may be drawbacks too.

They hope that if the new technology proves economical, it could supply more water for cities and suburbs that are vulnerable to shortages during droughts, while avoiding the environmental drawbacks of large coastal desalination plants.

These drawbacks are particularly glaring when it comes to running, and winning, a presidential campaign.