The latest stories from the Science & Environment section of the BBC News web site.
Updated: 6 min 7 sec ago
Armed conflict and civil disturbance in the Middle East since 2010 have had the unintended consequence of making the air cleaner.
The appearance of the five grey wolf pups and two adults could signal a return of the animals, which haven't been found in the state since 1924.
A message in a bottle that washed up more than 108 years after it was thrown into the sea may be the world's oldest, a marine association says.
It's the first music video Niall, Liam, Louis and Harry have released without Zayn.
The Cassini probe to Saturn returns its final close-up images of the Dione moon as it begins its "long goodbye".
US researchers say it has become "virtually impossible" to plant genetically modified trees in any part of the world.
A new study confirms humans' status as a unique super predator, and points to ways our impacts on other species could be lessened.
July was the hottest month on Earth since records began in 1880, according to US scientists.
British troops are on their way to Gabon on the west coast of Africa to tackle an increase in ivory poaching.
The US space agency has issued another of the "selfie" portraits acquired by its Curiosity rover on Mars, but this one is taken from a much lower angle.
Chemists discover a way to take carbon dioxide from the air and make carbon nanofibres, a valuable manufacturing material.
Ten years of public sightings show that large marine mammals are regularly found in the River Thames.
A blue whale emerges from the ocean, just as a BBC presenter is explaining how hard they are to find.
A new probe sticks to blood clots so they "light up" in a PET scan, and could eventually save time during treatment of stroke and related conditions.
Japan has successfully launched an unmanned spacecraft bound for the International Space Station.
Software that helps Prof Stephen Hawking to speak via a computer has been published online by Intel, the company that created it.
Confusion over the types of coal being burned in China's power stations means its carbon emissions have been overestimated, say researchers.
New lab results show how collisions between comets and planets can make the molecules that are the essential building blocks of life.
Have we underestimated our ancestors?
Chemists isolate the pleasantly perfumed active chemicals in sweetgrass - a plant used by Native Americans to fend off mosquitoes.