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.
Eight million tons of plastic end up in the ocean every year. One forecast suggests that by 2050, there could be more plastic in our oceans than fish. British yachtswoman, Emily Penn, has become a tireless campaigner against ocean plastics. She now raises awareness on the topic and conducts scientific research in some of the most remote parts of our world.
Huge amounts of plastic waste end up in the oceans every year. Now the European Union has taken action - by getting a step closer to banning plastic plates, drinking straws and other and other disposable plastic products. EU lawmakers agreed on the measure in Brussels on Tuesday.
We are drowning in plastic! It pollutes our oceans, beaches, rivers and forests. Let's talk solutions. We meet "trash heroes" in Indonesia's Bali who are trying to do away with plastic. The East African country of Kenya was so fed up with its plastic waste, it imposed a ban on plastic bags one year ago. We check in to see how they are faring. And we have more on bioplastics.