Egg production has increased but the industry's environmental impact has decreased, according to a study conducted from 1960 to 2010. Greenhouse gas emission are down 71%, water consumption by hens is down 32% per dozen eggs, and hens are producing 27% more eggs per day. "The U.S. egg industry has evolved remarkably over the past five decades by incorporating new technologies to protect natural resources," said lead researcher Hongwei Xin, animal science professor at Iowa State University and director of the Egg Industry Center.

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