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The US is to establish "the largest area of protected sea in the world", banning fishing and mining, around its Pacific islands.
Nasa says its Phoenix lander on the surface of Mars has gone silent and is almost certainly dead.
The colourful world of coral reefs is under threat as oceans absorb greater quantities of carbon, but not all hope is lost.
Environment correspondent Richard Black's diary of the IUCN World Conservation Congress, which is being held in Barcelona, Spain.
Shark antibodies could be a weapon in the fight against cancer, say Australian scientists.
Dr Tom Pike, from Imperial College London, shares his experiences of being part of the Phoenix Mars probe team.
Scientists hope secretions from maggots can produce an antibiotic to tackle MRSA and other infections.
Martian soil appears to contain sufficient nutrients to support life - or, at least, asparagus - Nasa scientists believe.
Natural CO2 vents on the sea floor show scientists how life will be affected as carbon emissions acidify the oceans.
There are a variety of theories about influencing the sex of a baby. But do they have any scientific merit or are they just old wives tales?
A fossilised "sea monster" found in the Arctic is the largest reptile of its type known to science, scientists say.
Tiny sea creatures called pteropods may teach scientists about how climate change will affect the oceans.
A hi-tech gel could provide an alternative to major surgery for chronic lower back pain, a study suggests.
Wiltshire's truffle fields produce a bumper harvest despite the recent heatwave.
Emergency crews exposed to dust after 9/11 had substantial reduction in lung function.
New mineral maps are helping scientists piece together a detailed picture of the Red Planet's history.
The number of people with medical problems linked to dust fallout from the 9/11 attacks rises to at least 15,000.
Kenya's Turkana people have long struggled with poverty and deadly cattle-raids - now a severe drought threatens them with starvation.
Researchers have identified a key component of the mechanism sperm use to speed progress to the egg.
Scientists have developed a coating for medical implants that could help cut the risk of rejection and infections like MRSA.
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