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Earth

Green Machine: Markets hint at 100-year energy gap

A study of share prices suggests investors don't expect alternative-energy technology to take off until 2140 – a century after we run out of oil

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Earth

Green machine: Heat scavengers come in from the cold

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Cold climates no bar to biogas production

Earth

Cold climates no bar to biogas production

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Solar power could crash Germany's grid

Earth

Solar power could crash Germany's grid

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Technology

Work light twice as hard to make cheap solar cells

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Technology

Charge your phone with a beach towel

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Space

Out-of-this-world proposal for solar wind power

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Oil company to build longest floating vessel ever

Technology

Oil company to build longest floating vessel ever

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Technology

Japan to begin drilling for methane in undersea slush

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Technology

Born-again solar cells are more efficient

Solar cells can be made more efficient over their lifetime if they continually regenerate their light-harvesting mechanisms

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Technology

Green machine: Squeezing solar juice from jellyfish

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Technology

Edible crystals could store hydrogen fuel

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Earth

Briefing: How bad is the new Gulf oil rig fire?

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Earth

Mobile chargers could keep electric cars juiced up

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