This is completely disruptive to the energy industry if it can scale!  Finally electricity can be made from evaporating water:

An immensely powerful yet invisible force pulls water from Earth to the top of the tallest redwood and delivers snow to the tops of the Himalayas. Yet despite the power of evaporating water, its potential to propel self-sufficient devices or produce electricity has remained largely untapped — until now.

In the June 16 online issue of Nature Communications, Columbia University scientists report the development of two novel devices that derive power directly from evaporation — a floating, piston-driven engine that generates electricity causing a light to flash, and a rotary engine that drives a miniature car.

Let’s check this thing out in the video on page 2

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