There have been a couple of international agreements (at the UN biodiversity convention last year, for example, when governments agreed there should be no geo-engineering schemes that damage nature).

BBC: Science & Environment

Fiji wants 30% of its waters protected and European nations including the UK are slowly imposing their own marine protected zones, prompted by the UN Convention on Biodiversity (CBD) which was initiated at Rio.

BBC: Shortages: Fish on the slide

Some 18, 000 participants representing 193 State Parties to the UN Convention on Biological Diversity and their partners attended the Nagoya Biodiversity Summit in Japan this October to agree a global deal to protect biodiversity.

UNESCO: Global Deal to Protect Nature