In the most comprehensive assessment of its kind to date, a new study released today reveals that marine protected areas (MPAs, national parks at sea) deliver a range of economic benefits to the fishing and tourism industries. The study examined more than 50 protected areas in more than 30 countries in North America, South America, Europe, Africa, Asia and Oceania representing diverse ecosystems to find that, in all cases, MPAs boosted either fishing or tourism, with some profits in the billions.