Changing global nitrogen cycle impacting human health

Despite greatly increasing food production for humans, the growing use of nitrogen as a nutrient is affecting people’s health far beyond just the benefits of growing more crops, according to a new University of Colorado at Boulder-led study. Study leader Alan Townsend of CU-Boulder’s Institute for Arctic and Alpine Research said changes in the global nitrogen cycle, while beneficial in increasing crop growth, appear to pose a growing health risk. Roughly half of the inorganic nitrogen ever used on the planet has occurred in the past 15 years.

New Climate Model Predicts Greater 21st Century Warming

For the first time, scientists have incorporated multiple human and natural factors into a climate projection model. They predict that increased carbon dioxide in the atmosphere, due to changes in the carbon cycle, combined with a decrease in human-produced sulphates, may cause accelerated global warming during the 21st century, as compared with simulations without these feedback effects.