Figure 23.23 Protected terrestrial and marine areas. (a) Terrestrial ecosystems have a longer history of being protected and this level of protection has increased over the past 40 years. (b) Marine ecosystems began receiving protection much later, but the amount of protected marine habitats has also grown over time. A small amount of additional terrestrial and marine habitat has been protected, but the initial year of protection is unknown so it is not shown.

Data from Secretariat of the Convention on Biological Diversity, 2010. Global Biodiversity Outlook 3 (Montréal, 2010, 94 pages) http://www.cbd.int/doc/publications/gbo/gbo3-final-en.pdf.