BBC

Wild hippos honk to each other and can recognise their companions' voices, a study has found.

Alok Sharma warns that unless there's swift action this year, progress made at COP26 will be lost.

Matthew Willson was killed by a stray bullet that travelled through a wall.

The banana-like crop has the potential to feed more than 100 million people, according to research.

Illegal dumping of rubbish is on the rise as criminals exploit flaws in the system.

Marine explorers find a "pristine" 3km coral reef at depths of 30m off the coast of Tahiti.

On a British island at the edge of the Antarctic is one of the most remote tourist spots in the world.

A growing number of people are changing to more environmentally-friendly jobs.

Campaigners say thousands of incidents are not being investigated because of a lack of resources.

For some technologies there are never any clouds to spoil the view.

Analysis suggests seven water companies illegally dumped sewage thousands of times between 2017 and 2021.

A Royal Society report recommends against censoring scientific misinformation online.

Pollution from plastics is a global emergency in need of a robust UN treaty, according to a report.

Lots of factors are at play in new data, including better home insulation and flu vaccinations.

Ministers say coping even with low levels could cost the country billions of pounds a year.

Nasa fixes malfunctioning equipment on a new rocket designed to take astronauts to the Moon.

When the huge eruption happened over the weekend, a fleet of spacecraft overhead gathered key data.

A charity director says the country's coal mining history means it has released a lot of carbon.

Up to 80,000 people could be affected after tsunami waves caused "significant damage" to Tonga.

While further tsunamis may be unlikely, there are mounting fears over how badly Tonga has been hit.