Ohio dairy farmers strive to conserve natural resources and minimize the environmental impact in everything they do — from properly managing manure and protecting the rivers and streams to reducing odors and air pollutants. Advanced, modern technologies have allowed dairy farmers across Ohio to work more efficiently while protecting the environment. Today, a gallon of milk is produced with 65 percent less water and 63 percent less carbon than a gallon of milk in 1944.U.S. dairy cows generate the fewest greenhouse gas (GHG) emissions per gallon of milk. The U.S. dairy community is committed to continuous improvement when it comes to environmental stewardship, including a voluntary goal of 25 percent GHG emission reduction by 2020.