We answer a question from one of our viewers - Javad Hekayati from Shiraz, Iran.
Despite being one of the lowest-cost and most reliable renewable energy sources, harnessing heat from the Earth almost doesn't happen outside Iceland. But leaders meeting in Italy this week are trying to change that.
Kenya is set to become Africa's biggest producer of clean geothermal power over the next five years.
Iceland's biggest national park includes volcanoes, the continent's biggest glacier and spectacular vistas. It is also home to magnificent waterfalls powered by mountains of melting ice.
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