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Earth

Green machine: Heat scavengers come in from the cold

After decades of research, cost-effective ways of harnessing free heat might soon be in reach

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Green machine: Trees may spell trouble for wind power

Earth

Green machine: Trees may spell trouble for wind power

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Green machine: Where do solar cells go when they die?

Earth

Green machine: Where do solar cells go when they die?

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Green Machine: Wind farms make like a fish

Earth

Green Machine: Wind farms make like a fish

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Green machine: Why our walls really should have ears

Earth

Green machine: Why our walls really should have ears

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Green machine: Squeezing solar juice from jellyfish

Technology

Green machine: Squeezing solar juice from jellyfish

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Green machine: Perfecting the plant way to power

Earth

Green machine: Perfecting the plant way to power

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Green machine: Wave power line jacks into the grid

Earth

Green machine: Wave power line jacks into the grid

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Green machine: Fighting the efficiency fallacies

Earth

Green machine: Fighting the efficiency fallacies

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Green machine: Don't burn plant waste, bury it

Earth

Green machine: Don't burn plant waste, bury it

Converting plant waste to biochar leads to bigger cuts in carbon emissions than turning it into biofuels – and brings other benefits too

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Technology

Green machine: Plug-free electric cars' hidden cost

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Earth

Green machine: Aircon that doesn't warm the planet

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Earth

Green machine: A salty solution for power generation

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Space

Smoke-detector isotope to power space probes

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