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‘It was an accident’: the scientists who have turned humid air into renewable power
(www.theguardian.com)
This is a most excellent place for technology news and articles.
There's always some humidity, so I guess in the end it depends entirely on how efficient they can make this technology. It's probably a bit too early to say.
That said, if you live in a tent in the Sahara you probably shouldn't postpone investing in solar panels over this.