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energy efficiency

Christmas trees could make a great green fuel

Earth

Christmas trees could make a great green fuel

An air-free roasting process readies trees and other biomass to replace coal as fuel for power plants

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2011 preview: Charge of the electric car

Earth

2011 preview: Charge of the electric car

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Is night falling on classic solar panels?

Earth

Is night falling on classic solar panels?

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Sun and sand breed Sahara solar power

Earth

Sun and sand breed Sahara solar power

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Cloud lasers: Hunting quantum secrets in the skies

Earth

Cloud lasers: Hunting quantum secrets in the skies

Features

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Earth

Biofuels will up Euro greenhouse emissions

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Earth

Green Machine: Markets hint at 100-year energy gap

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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

Soon there could be so many solar cells in Germany that the country's power system will be overwhelmed

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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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Technology

Oil company to build longest floating vessel ever

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