A UN conference begins this week in Portugal that could lead to progress towards an agreement to protect the world's oceans.
The oceans cover more than 70% of our planet. They provide about half of the planet's oxygen and absorb more CO2 than Earth's atmosphere.
At the same time, they are exposed to the dangers of global warming, overfishing and plastic pollution.
It is claimed that large expanses of ocean must be protected from human activity in order for them to regenerate.
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