• percentage of all endangered and threatened species in the U.S. that are harmed by grazing

• number of plant species that provide 90 percent of the world’s food supply

• percent by which wind power production has grown per year since 1990

• percentage of Earth’s original forests that remain pristine and undisturbed

• percent increase since 1945 in the agricultural harvest lost to pesticides

• percentage of wood used in building a new home that could be saved by framing more efficiently

• percentage of the world’s endangered vertebrate species that are threatened by exotic invaders

• percent by which Americans tend to overwater their lawns

• percentage of the CFCs in use in 1995 that were obtained on the black market

• percentage of paper produced worldwide that was discarded in the U.S. in 1994

• percentage of U.S. commuters that carpooled in 1980, compared to the 8 percent that are expected to carpool in 2000

• percentage of municipal solid waste that is food packaging

• gallons of water can be saved by putting a trigger nozzle on a hose when washing a car

Sources:
1 — Natural Resources Defense Council
2 — National Wildlife Federation
3 — Union of Concerned Scientists
4 — Natural Resources Defense Council
5 — Earth Communications Office
6 — Natural Resources Defense Council
7 — World Resources Institute
8 — 50 Simple Things You Can Do to Save the Earth
9 — World Resources Institute
10 — Environmental Defense Fund
11 — USA Today
12 — Earth Communications Office
13 — 50 Simple Things You Can Do to Save the Earth