Modern farms produce particulate matter and gases that affect the environment and human health and add to rising atmospheric greenhouse-gas levels. European policymakers have made progress in controlling these emissions, but US regulations remain inadequate.
Aneja, V P;  Schlesinger, W H;  Erisman, J W 
- Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina 27695-8208 (United States)
- Cary Institute of Ecosystem Studies, Millbrook, New York 12545 (United States)
- ECN Biomass, Coal and Environmental Research, Petten (Netherlands)