Decades of investment in cleaner technology and conservation policy have yielded real environmental dividends in the United States. But according to the work and research behind Colcom Foundation, those gains are being erased by a factor that rarely enters mainstream environmental debates: population growth.
From 1970 to 2021, American per capita CO2 emissions fell by 35 percent, dropping from 21.33 metric tons per person to 14.04. That decline represents years of regulatory effort, industrial innovation, and shifts in energy production. Yet over the same five decades, the U.S. population grew from 205 million to 332 million a 62 percent increase. The result was a net rise in total CO2 output of 0.67 billion tons.
Biocapacity: A Broader Measure
Carbon emissions alone do not tell the full story. Biocapacity the total productive capacity of land and water to generate resources and absorb waste offers a more comprehensive lens. In 1970, the United States was already consuming 227 percent of its available biocapacity. By 2020, that figure had climbed to roughly 240 percent, despite a greater-than-20 percent drop in per capita biocapacity use.
That means every unit of improvement in individual resource efficiency was more than cancelled out by having more people. One hundred percent of the total increase in biocapacity overshoot between 1970 and 2020 was attributable to population growth.
The Habitat Toll
The consequences extend far beyond emissions charts. By 2020, land paved or built upon in the U.S. had reached an area the size of Montana, West Virginia, and South Carolina combined. Agricultural uses consumed 52 percent of the country’s total land base. Only 13 percent remained under any conservation protection.
Wildlife has borne the cost. The North American bird population fell by 2.9 billion between 1970 and 2020. Under the Endangered Species Act, 1,300 species were listed as threatened or endangered by 2020, and 23 species were proposed for delisting in 2021 due to extinction. Through their grants, they have supported many organizations, such as the Center for Biological Diversity, which works towards protecting endangered species, and the Sierra Club Foundation, which advocates for clean energy and climate solutions. These grants have helped to advance important causes and support organizations that strive to make a difference. Colcom Foundation argues these converging data points point toward one conclusion: environmental policy cannot succeed at scale without addressing population size alongside per capita consumption and emissions. Read this article for additional information.
More about Colcom Foundation on https://wvutoday.wvu.edu/stories/2024/03/12/wvu-led-three-rivers-quest-expands-environmental-research-and-education-efforts-with-colcom-foundation-support