BBC
Cambridge University to cut fossil fuel investments by 2030
The university says it is responding to the "urgent existential threat" of climate change.
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What wobbling rocks can tell us about nuclear safety
How precariously balanced rocks will inform the earthquake hazards faced by critical infrastructure.
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Covid: Vaccine will 'not return life to normal in spring'
Leading scientists call for realism about what a vaccine against Covid can achieve next year.
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Plastic straw ban in England comes into force
Businesses can no longer sell or supply the single-use items as part of efforts to reduce pollution.
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Covid-19: Funding crisis threatens zoos' vital conservation work
The body that represents British zoos says they are facing the biggest cash crisis in their history.
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Extinction crisis: World leaders say it is time to act
As world leaders line up to address the UN biodiversity summit, experts say our future is at stake.
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Biodiversity: Why the nature crisis matters, in five graphics
Human destruction of nature has led to the extinction of many plants and animals.
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Space station crew woken up to hunt for air leak
Ground controllers say the leak is coming from a Russian module on the International Space Station.
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Berlin patient: First person cured of HIV, Timothy Ray Brown, dies
Mr Brown, known as the Berlin patient, was cured after a bone marrow transplant to treat leukaemia.
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Two-fifths of plants at risk of extinction, says report
We are failing to harness the many benefits plants can provide, say scientists.
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Great Barrier Reef: Uncovering the secrets of Australia's deep waters
Scientists explain how the biggest deep-sea study of two marine parks led to exciting discoveries.
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Hydrogen-powered train makes UK maiden journey
The Hydroflex made a 25-mile round-trip in Warwickshire, reaching speeds of up to 50 mph.
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Zimbabwe: Elephants die from 'bacterial disease'
More than 30 elephants were found lying on their stomachs, according to wildlife officials.
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Covid-19: Milestones of the global pandemic
We track some of the key moments in the spread of Covid-19 around the world.
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Rio Tinto: Mining giant accused of poisoning rivers in Papua New Guinea
More than 150 people in Bougainville have filed a complaint against the embattled Rio Tinto company.
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Buried lakes of liquid water discovered on Mars
The underground lakes were detected in the Red Planet's south polar region.
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Anger as Brazil revokes mangrove protection regulations
Environmental groups have called the move to revoke regulations that protect mangroves a "crime".
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The water-saving device wasting billions of litres every week
Low flush toilets often waste more water than they save due to poor engineering and confusing buttons.
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Sir David Attenborough warns world leaders over extinction crisis
The naturalist uses a UN event to call on world leaders to do more to protect nature.
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Maple trees offer most protection from harmful UV
A species of maple tree gives the best protection from damaging sunlight, a study suggests.
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