Pumping very salty water into the ocean has surprisingly little impact on marine life.
It's quite hard to tell when a sea creature is extinct – there's always hope it will turn up somewhere.
We take salt water for granted, and often overlook how important it is for our own lives and in sustaining a healthy planet.
A new project takes a different look at the role of oceans.
Forget the scare stories, sharks are good for our oceans.
Waves lap against the shore on the south coast of England and the North coast of France – but the answer to this puzzle is in the wind and the land, not the waves themselves.
Megalodons are the latest Hollywood monster to leap out of the fossil record, but what else is lurking in prehistoric seas?
Strange frond-like sea creatures are among the planet's earliest animals, but new research dates them and the entire animal kingdom to much earlier than first thought.
Plastic bags are commonly mistaken for food by sea animals. They require a lot of energy and resources to be made, and have caused floods in some countries.
The world has some 500 million square kilometres of ocean. But just 55 million square kilometres remain untouched by intensive human activities such as fishing.
Elusive and mysterious by nature, ordinary people are revealing the secrets of the UK's octopuses.
Tech fixes to environmental problems are guaranteed to grab attention, but real change for the planet requires community organising.
If we are truly invested in addressing the issue of marine plastic and offsetting the potential harms, we have to understand which fish eat plastic and which ones don't.
Why do whale sharks come together at just 20 locations around the globe?
The Big Bang created a cloud of dust and rocks that included a lot of rocks that were made of ice, like giant snowballs. That's where some of the water came from.
How can marine preserves best protect sea creatures that move in and out of them? Two ocean scientists describe new thinking about designing marine protected areas.
DNA sequencing is making it possible for scientists to identify thousands of species of zooplankton – drifting animals that are key links in ocean food webs.
Marine heatwaves have had little attention until recently, but they're already having large effects.
At Kīlauea in Hawai'i, a recent volcanic eruption has created some of the most spectacular sights in nature. But also danger for those around it.
Scientists have mapped a huge dead zone in the Gulf of Oman, without enough oxygen in the water to support life. This Speed Read explains why dead zones form in waters around the world.