• percent by which energy-efficient windows can cut cooling and heating bills

• percentage of the world’s population living in countries experiencing moderate to high water stress

• percentage of toxic water pollution caused by personal vehicle use

• percentage of the world’s energy consumed by developing nations

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• percentage of all raw materials used in the U.S. that go toward the production of meats, dairy products, and eggs

• percentage of the world’s remaining temperate rainforests that are in Chile

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1 — Alliance to Save Energy
2 — World Resources Institute
3 — Earth Communications Office
4 — World Resources Institute
5 — 50 Simple Things You Can Do to Save the Earth
6 — Christian Science Monitor