According to National Geographic magazine, some ecologists have calculated that “over a third of known land plants and vertebrates are confined to less than 2 percent of the planet. ”
Ajakiri „National Geographic ” teatab, et ökoloogide arvestuste järgi„ elab enam kui kolmandik teadaolevatest maismaataimedest ja selgroogsetest vähem kui 2 protsendil meie planeedi pindalast ”.