In the early 1970s, when Hugo wrote "For Jennifer, 6, On the Teton," many of the rivers and lakes in the United States were heavily polluted. Lake Erie was dying, algae blooms choked the Potomac River, threatening public health, and authorities estimated wetlands losses at more than 400,000 acres annually. Dead fish regularly appeared on shorelines, and two-thirds of America's waters were unsafe for fishing and swimming. Just a few years before, in 1969, the Cuyahoga River in Cleveland, Ohio, was so polluted that it caught fire. The sight of the burning river on evening newscasts mobilized the nation and became a rallying point for passage of the Clean Water Act in 1972. Although the Federal Water Pollution Control Act of 1948 provided state and local governments with funds to address water pollution problems, the federal government viewed water pollution as primarily a state and local problem and did not issue goals...