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Radioactive diamonds are turned into batteries that last for thousands of years

Iceland taps into underground river of magma

15 things Obama has done for the environment

First wave energy station in U.S. generates power in Hawaii

How trees combat the urban heat island effect

Dam goats scale dam rocks in search of salt

How you can visit the Shire ... in Guatemala

The Negawatt is ready for its close-up

British cemetery could be illuminated by energy generated by the deceased

3 'miracle' car concepts that will never happen

Ted Cruz's half-baked position on ethanol