First treaty to protect the high seas comes into force | A United Nations agreement for the “conservation and sustainable use of marine biological diversity” in the open oceans has now taken effect

The treaty’s first challenge will be choosing the right areas to protect,

Enforcement will also be difficult.

While the treaty has been signed by 145 nations, it’s only binding on those that ratify it. So far 83 have, but not the UK, US, Canada or Australia.