Prof Joanna Haigh from Imperial College London explains why this gas has played a crucial role in shaping the Earth's climate.
Flying insects have declined by more than 75% in 30 years in German nature reserves, alarming ecologists.
Animals were transported from as far away as the north east of Scotland to the Neolithic site in Wiltshire.
A shocking image of a dehorned black rhino makes Brent Stirton Wildlife Photographer of the Year.
New research casts doubt on the idea that dogs are naturally more tolerant and friendly than wolves.
Scientists convert the gravitational wave signal from merging neutron stars into sound.
Scientists detect the warping of space generated by the collision of two neutron stars.
The Saetereng family are trying to live a sustainable lifestyle in Akkarfjord, northern Norway.
World Land Speed record holder Andy Green describes the sensation of starting up the Bloodhound supersonic car for the first time.
The ‘Seabin’ can collect the equivalent of around 83,000 plastic bags a year.
A year in school adds nearly a year to your life, study in Edinburgh shows.
Sentinel-5P lifts off from Russia to make 20 million daily observations of pollution across the globe.
A US space agency satellite provides new insights on how CO2 is moved through Earth's atmosphere.
Only two chicks survived in a colony of 36,000 in a "catastrophic" breeding season in east Antarctica.
Fitted with a body camera, a sewer engineer tries to remove a blockage.
What will it take to build the ultra-fast internet of the future?
Rising global emissions of some chemicals could slow the progress made in healing the ozone layer.
The changes are part of the Clean Growth Plan to reduce the UK's greenhouse emissions.
A house-sized asteroid passes close to Earth, allowing scientists to rehearse future strike threats.
An Antarctic ice shelf is shown to have a deep gorge cut in its underside by warm ocean water.
Past mass extinctions have the potential to guide modern conservation efforts, say scientists.
A team of British scientists flies around Iceland's volcanoes to find out how to avoid future air traffic disruption.
We continue to buy new clothes at an incredible rate. How can manufacturers reduce fashion's environmental footprint?
The sighting in North Ronaldsay is believed to be the first time an adult male Siberian blue robin has been seen in the UK.
Black carbon trapped in the feathers of songbirds gives new insight into historic US air quality.
Key modifications for flight happened as early as 120 million years ago, a fossil discovery suggests.
UK scientists will take a ship to explore waters exposed by a huge new iceberg in the Antarctic.
Almost two thirds of mussels in the sea around Kent are contaminated with plastic particles, research has shown.
British scientists played a key role in developing radar, which has helped deliver safer skies.
Teams from around the world are competing on solar cars in an epic transcontinental race.