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Which oil-mopping technology will win $1.4m X prize?

Filters, centrifuges, and oil-gulping ships may be among the contenders for a new X prize designed to avert another Deepwater Horizon disaster

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Earth

E. coli engineered to make convenient 'drop-in' biofuel

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US food waste worth more than offshore drilling

Earth

US food waste worth more than offshore drilling

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Green machine: A salty solution for power generation

Earth

Green machine: A salty solution for power generation

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Technology

Alternative nuclear fuel is surprisingly reactive

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Green machine: A new push for pond scum power

Earth

Green machine: A new push for pond scum power

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Stabilisers will let deep-sea wind turbines stand tall

Earth

Stabilisers will let deep-sea wind turbines stand tall

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Earth

Hot electrons could double solar cell efficiency

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Mystery glitch? Blame it on the sun

Space

Mystery glitch? Blame it on the sun

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Green machine: Bacteria will keep CO<SUB>2</SUB> safely buried

Technology

Green machine: Bacteria will keep CO₂ safely buried

Sequestering the carbon from fossil-fuel power stations can cut emissions – and there's a new recipe to keep it locked away underground

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Earth

Second well on the way to cap Deepwater Horizon

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Earth

Green machine: Recycled batteries boost electric cars

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Earth

Wonderfuel: Welcome to the age of unconventional gas

Features

Earth

Green machine: Cars could run on sunlight and CO₂

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