Matters of Scale - Biodiversity Factors
Time it takes to grow 1 inch of soil
Time it has taken to erode and wash away one-third of the topsoil in the United States
Number of fish caught by a single Norwegian boat in 1986
Number of people in Norway
Kilograms of toxic chemicals that would be removed from the environment each year if U.S. homeowners reduced their use of pesticides by 10 percent
Kilograms of toxic chemicals that would be removed from the environment each year if U.S. manufacturing firms reduced their releases by 10 percent
Number of black rhinos in Africa in the 1960s
Number of black rhinos in Africa now
Number of pieces of live coral broken off from reefs (which are habitat to 1 million species) and purchased by Americans each year
Number of pieces purchased by the rest of the world each year
Number of Boeing 747 airplanes that could fit on the ground in New York's Yankee Stadium
Number of Boeing 747s that could fit inside the largest size of trawl net used to catch ocean fish by commercial "factory ships"
Sources: "Biodiversity 911: Saving Life on Earth," a traveling exhibit of the World Wildlife Fund, and Worldwatch Institute.