We have increased protected area coverage from 3% terrestrially in the early 1980s to nearly 13% now, and theBiodiversityConvention has set a terrestrial target of 17% by 2020.
There have been a couple of international agreements (at the UN biodiversityconvention last year, for example, when governments agreed there should be no geo-engineering schemes that damage nature).
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.