A hundred to one

If we were to expand marine protection from less than 1% to 30%, say, what would that cost? Establishing reserves, policing them and so on, would cost about $40-50bn per year - and the annual benefit would be about $4-5 trillion.

-- says Pavan Sukdev, study leader of TEEB. The study also finds the ongoing loss of forest comes with an annual pricetag of US $2-5 trillion.