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Janet K. Swim, professor of psychology, Penn State, and her colleagues report that growing consumption and growing population are two significant contributors to human impact on the environment. Both substantially increase carbon dioxide levels in the atmosphere, the researchers report in a special issue of American Psychologist that focuses on how psychology contributes to understanding and addressing global climate change. "Engaging in one type of environmentally friendly behavior can predispose one to engage in similar behaviors, inhibit other behaviors, or even increase environmentally harmful behaviors," said Swim.

Labeling products with information on the size of the carbon footprint they leave behind could help both consumers and manufacturers make better, environmentally friendly choices.

The United Nations food agency on Monday called for greater use of environmentally sustainable techniques by poor farmers in order to increase crop intensity to feed the world's growing population.

Nearly 3 billion pounds of chicken feathers are plucked each year in the United States -- and most end up in the trash. Now, a new method of processing those feathers could create better types of environmentally-friendly plastics.