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In terms of smog-pollutants, 2010’s cars are 98 percent cleaner than the gas-guzzlers on the road in 1970 when the EPA was born. Reorganization Plan No. 3 grew out of the National Environmental Policy Act, which Nixon symbolically signed on January 1, 1970—to signify that the 1970s would be the environmental decade. In 2002, on the 30th anniversary of the act’s passage, the EPA found that 39 percent of the rivers, 45 percent of the lakes, and 51 percent of the estuaries monitored were contaminated. The act has been amended many times, most significantly in 1987 to ramp up controls on toxic pollutants, and in 1990 to more adequately address oil spills after the Exxon Valdez disaster. Because of the phase out—which is 98 percent complete, according to Zaelke—the ozone layer has not grown thinner since 1998. However, since CFCs have a long atmospheric life, the ozone layer will not fully recover until “…after 2050,” says Zaelke. In the 1970s, chemists theorized that CFC molecules could be split apart by solar radiation to produce chlorine atoms, which could, in time, destroy the ozone.