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energy efficiency

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Earth

'Humanity at risk' from ecological debt

A UN planetary health assessment shows we need 1.4 Earths to sustain our lifestyles, prompting calls for more sustainable living

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Earth

Waste wafers give solar power a silicon boost

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Depleting oil supplies threaten 'meltdown in society'

Earth

Depleting oil supplies threaten 'meltdown in society'

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Light-harvesting nanowire could drive tiny devices

Technology

Light-harvesting nanowire could drive tiny devices

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Earth

Brazil rides biofuel bandwagon to Africa

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Earth

Mechanical 'fish' could tap turbulence for energy

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Pentagon backs plan to beam solar power from space

Earth

Pentagon backs plan to beam solar power from space

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Earth

Go nuclear for a third industrial revolution, says EC

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Earth

Semiconductor uses the sun to split water

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Grass-munching bugs could charge rural phones

Technology

Grass-munching bugs could charge rural phones

The bacteria-powered cellphone charger is aimed at poor countries where plant waste is more accessible than electricity

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Earth

Rocks could be novel store for wind energy

Features

Earth

'Smart roofs' can keep you cool and save energy

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Earth

Redesigned petrol engine promises green gains

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Technology

Computers learn to fly kites for renewable energy

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