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Trends in the incidence of childhood asthma worldwide have paralleled the sharp increase in carbon dioxide (CO2) emissions, over at least the last two decades. The prevalence of asthma in the United States has quadrupled over the last 20 years in part due to climate-related factors. In a report released by Harvard Medical School and the Center for Health and the Global Environment, it was noted that there was an increase in asthma incidence of 160% from 1980–1994 among preschool children. This observation was linked to the global rise in CO2 emissions, which in turn affects respiratory exposure to a variety of atmospheric pollens, mold, and fungi.1,2 While asthma is associated with genetic predisposition, the changing environment and air pollution are major contributory factors in the pathogenesis of the disease, and may help explain the rapid change in the incidence of asthma over the last few decades.3 Even though the actual amount of CO2 in the atmosphere is minute, greenhouse gases are very effective in forming a blanket that prevents heat from escaping the earth’s atmosphere.4  Dr Charles Keeling’s research laboratory at Mauna Loa on the Big Island of Hawaii records the amount of CO2 in the atmosphere, adjusted annually for seasonal variations. Analysis of ancient air bubbles trapped by glaciers reveals that the amount of CO2 consistently varied between 200 to 300 parts per million (ppm) for over 80,000 years.4  Since 1960, for the first time in the known history of the earth, CO2 emissions exceeded 300 ppm. In 1980, the levels approached 350 ppm, and have been increasing relatively rapidly ever since, according to the Keeling curve. In turn, global temperatures fluctuate in a pattern that is closely associated with the amount of CO2 in the atmosphere.4

Childhood asthma and anthropogenic CO2 emissions