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| Mon, 10th Aug 2020 15:29:00 |
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Agriculture replaces fossil fuels as largest human source of sulfur to the environment |
Historically, coal-fired power plants were the largest source of reactive sulfur, a component of acid rain, to the biosphere. A new study recently publishing Aug. 10 in the journal Nature Geoscience shows that fertilizer and pesticide applications to croplands are now the most important source of sulfur to the environment.
Acid rain gained attention in the 1960s and 1970s when scientists linked degradation of forest and aquatic ecosystems across the northeastern US and Europe to fossil fuel emissions from industrial centers often hundreds of kilometers away. This research prompted the Clean Air Act and its Amendments, which regulated air pollution, driving sulfur levels in atmospheric deposition down to low levels today.
"It seemed like the sulfur story was over," said Eve-Lyn Hinckley, assistant professor of environmental studies at University of Colorado, Boulder, and lead author of the study. "But our analysis shows that sulfur applications to croplands in the US and elsewhere are often ten times higher than the peak sulfur load in acid rain. No one has looked comprehensively at the environmental and human health consequences of these additions."
Sulfur is a naturally occurring element that exists primarily in stable, geologic forms and is an important plant nutrient. Through mining activities, including fossil fuel extraction as well as synthesis of fertilizers and pesticides, sulfur is brought into air, land, and water systems. It can react quickly, and, as decades of research on acid rain showed, affect ecosystem health and the cycling of toxic metals that pose a danger to wildlife and people.
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