"It's a promising result," said Ken Caldeira, a climate scientist at the Carnegie Institution for Science who was not involved in the project. "If this could be done at a large scale and costs could be brought down, then it would be very promising indeed."

The project took place at the Hellisheidi Geothermal Power Station, the biggest thermal power plant in the world and the energy provider for Reykjavik, Iceland's capital. Usually thermal plants don't emit much greenhouse gas, but the facility produces around 5 percent of the emission of a coal-fired plant because it taps into volcanic heat that also emits carbon dioxide.

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