Concentrations are now at their highest for 800,000 years, which could lead to "severe ecological and economic disruptions", according to a new report.
The surface of Mars suggests that it was moved around and formed by flowing water, but there has never been enough water on the planet to do this.
The dinosaur fossil, which was found in the South of France, is believed to be a primitive cousin of Iguanodon and has been named Matheronodon provincialis.
Nasa's Halloween playlist includes eerie radio emissions from Saturn to hair-raising sounds from Jupiter's largest moon Ganymede.
Nasa's Juno mission has been hard at work collecting data for scientists to study. Here are a few revelations that Juno has made over the last few months.
Is it possible to live an ordinary life, hold down a job, travel, shop and eat in London without throwing away any plastic?
Unseasonally warm and sunny October draws to a close with the arrival of freezing temperatures.
The atmosphere on the darker side of hot exoplanet Kepler-13Ab was found to experience snowing in the form of titanium oxide.
The mission was launched to provide useful insights into how our planet is changing with the movement of water, ice, and solid Earth components.
There are several observatories and space missions that are dedicated to observing the sun and studying space weather.
Astronauts living in the International Space Station spoke to Pope Francis in a unique and harmonious exchange of science and religion.
The week's best news and sports photos, from autumn and Halloween to the King of Thailand's funeral and the end of the sieges of Raqqa and Marawi.
The 5.5 metre-long Jurassic ichthyosaur is believed to be one of the most complete skeletons of its kind ever found in India.
Ceres is the largest rock in the asteroid belt and one of the candidates for finding life in the solar system.
The December mission will mark the first flight from the refurbished launch pad SLC-40 since the explosion.
Harlequin ladybirds are the UK's fastest invading species and are larger and more aggressive than more commonly found types.
The colour patterns of dinosaurs resemble those seen in many modern animals, helping them to avoid detection by both predators and prey.
Previous eruptions triggered a volcanic winter that lowered global temperatures by 6 degrees Celsius, halting a period of natural global warming.
The comet entered the Solar System travelling at a speed of 26 Kms per second and may have come from the constellation Lyra, where the bright star Vega resides.
Sand dunes on Hellas Planitia have large, linear scratch marks on its sides at high latitudes.
The latest generation of the RoboBee has potential uses ranging from search-and-rescue operations to environmental monitoring and biological studies.
New research has re-examined the skull, which was first discovered 12 km inland from Papua New Guinea's north coast in 1929.
The dinosaur footprints measured 57cm long, suggesting it was was around 30ft tall - around four times the size of a fully-grown lion. It roamed what is now southern Africa 200 million years ago.
Humans would live in multiple transparent spheres, each containing numerous self-sustaining towers covered in plants.
The note, which Einstein gave to a courier in Tokyo, recently resurfaced after it was hidden away for nearly 100 years.
Hawking's thesis was made public by Cambridge, over 50 years after it was first written and has since reportedly been viewed by over 400,000 people.
Sir David Attenborough has called on people to cut down on their use of plastic. These nine items show how plastic-filled our lives are, and how easy it is to cut down on the material.
The BBC admits it breached its own editorial standards when Lord Lawson was allowed to express a falsehood about climate change on the Today programme without being challenged.
The 500-year-old object, called an astrolabe, was used by ancient seafarers to measure the altitude of the Sun.
A photo and video of a moth with what seems to be huge tentacles growing out its back has gone viral - but it is more normal than it seems.