BBC News

We look back at some of the major stories of the year in science and the environment.

Hundreds of people affected by severe flooding four years ago have sought mental health support.

More than a million birds are trapped every year in the British Isles by volunteers.

Nasa wants to send humans to Mars one day, but do we have the engines to get us there?

A study attempts to assess the devastation caused by the invasive emerald ash borer in US forests.

British sign language is receiving an astronomical update thanks to a unique collaboration between a space scientist and a group of deaf astronomers.

The discovery was made by scientists at a 4,000-year-old archaeological site in the Hebrides.

The amount of food needed to feed the world's population by the end of the century could increase by almost 80%, a study suggests.

Boeing's Starliner spacecraft returned early after a timing error meant it failed to dock with the ISS.

The uncrewed demonstration of Boeing's Starliner capsule is cut short because of technical problems.

Justin Rowlatt lands in a dazzling white and blue world to join scientists checking up on Antarctic ice.

These three teenagers are passionate about issues they see around them, and are training to be activists at The Advocacy Academy in London.

The top court upholds a ruling requiring 1990 levels to be cut by at least 25% by the end of 2020.

The test flight has a dummy on board but, if successful, astronauts are due to start using the craft from 2020.

Camille Schrier, who wowed judges with a science experiment, said she aims to "break stereotypes".

Fossil trees, dating back 386 million years, have been found at an abandoned quarry in New York.

The original series sets out to explain and demystify artificial intelligence technology.

Next year is expected to be another warm year, extending the series of the hottest on record.

Modou Fall had to get creative to get people thinking more about plastic waste in Senegal.

The Mekong river is being damaged by sand extraction, adding to calls for limits on sand usage.

An ancient ancestor of modern humans survived into relatively recent times in South East Asia.

Ship owners announce plans for a $5bn fund to design zero-emissions vessels.

The Cheops space mission will get beyond just counting planets to start describing their properties.

The comments from the UK's official climate come ahead of a global climate conference in Glasgow.

Ancient DNA extracted from a tooth print in ancient "chewing gum" reveals new clues about our ancestors.

Purussaurus mirandai could grow to 10m in length and was able to move on land, scientists believe.

Cities have a bad reputation for pollution but - in terms of climate change - that might be unfair.

Kigali residents demand compensation as hundreds of houses vulnerable to flooding are knocked down.

Landslide debris from the collapsed Anak Krakatau volcano is pictured on the seabed for the first time.

Exhausted delegates reach agreement on the key question of ambition with tricky issues postponed.

The teenage climate activist says the phrase has a different meaning in her first language, Swedish.

UN climate change talks in Madrid are struggling to reach agreement on crucial measures.

The African continent is more vulnerable than any other region to the world's changing weather patterns.

Test data indicates a land speed record should be achievable, says the project's chief engineer.

The duelling animals were found floating in the waters off Quatsino, British Columbia.

A study of North America's only native parrot confirms its disappearance was down to humans alone.

Talks in Madrid enter their final day with serious divisions between large emitting countries and small island states

Colorado's National Eagle Repository is the only one of its kind in the world.

Scientists calculate the lifespans of long-lost species, including ancient human relatives.

Denman Glacier reaches down to more than 3,500m below sea level. Only ocean trenches go deeper.

Humans usually take minutes to learn how to find diamonds in the game, but AI agents struggled.

Researchers say the rock star did not introduce the non-native species in Carnaby Street in the 60s.

Around 200 environmental campaigners are barred from climate talks after Greta Thunberg speaks.

Experts say the art, found in an Indonesian cave, could be the world's oldest recorded story.

A factory in France is trialling a more efficient way of packaging orders, Emma Simpson reports.

Tributes are paid to the "larger-than-life" TV broadcaster, scientist and conservationist.

The 16-year-old Swedish schoolgirl has inspired a global movement to fight climate change.

Emissions from the region made a major contribution to global greenhouse gas levels in 2010-2016.

Teenage climate activist Greta Thunberg has addressed the COP25 summit, criticising politicians and CEOs.

Brazil, China, India and Saudi Arabia are criticised as anger grows at a UN climate change meeting.