Oceans cover more than two-thirds of the surface of the planet - yet they are still not fully understood.
The world's oceans play an important role in the Earth's climate system, and millions of people depend on them directly for sustenance. People also traverse the oceans, and use them to transport goods. Yet the world's oceans are in trouble, as warming and acidification take their toll. They've also become a garbage dump for the planet, with consequences for marine life.
Most people know of corals along coastlines - but there are also beautiful corals growing in deeper waters. Researchers at the GEOMAR Institute in Kiel, Germany, are running tests to see how these corals react to warmer and more acidic waters. Results are mixed.
When it comes to marine animals, charismatic species like dolphins and whales get all the attention. But what about the weird-looking creatures that also live in the ocean's depths? Although they're not beautiful, they still play an important role in marine ecosystems. Lucky for them, biologist and comedian Simon Watt has a special fondness for those hit by the ugly stick.
Our planet is full of amazing animals, peculiar plants, funky fungi and odd natural phenomena. DW's environment desk often researches the weird and wonderful creatures on earth. This week, reporter Jennifer Collins introduces us to what scientists call "the shrimp from Mars."
The world's oceans are full of weird and wonderful creatures. We splash down under the waves for a glimpse at some of the less charismatic species, we find out what's behind Europe's mysterious dolphin deaths, and we meet a tiny undersea sociopath who likes to smash things.
Contention over post-Brexit environmental regulation is bubbling over as the UK withdraws from a European fishing convention. Campaigners are concerned that important cross-border marine protections may be rolled back.
Much of the CO2 we emit through the burning of fossil fuels ends up in the ocean, making the water more acidic. Because ocean acidification happens particularly fast in cold water, that spells trouble for cold-water corals. How do they cope as their environment becomes warmer and more acidic?