Food Choices

Everybody eats. And consumers increasingly try to consider the 1 effects of their food choices. For example, if you want to eat meat, how do your choices compare? That's what a group of researchers set out to 2 . And they found that raising one animal is dramatically more environmentally draining than all the others: cows. The research is in the Proceedings of the National Academy of Sciences.The scientists noted the challenge in accessing data and creating metrics that can be compared across livestock and to potato, wheat and rice 3 . They settled on national data from the U.S. Departments of Agriculture, the Interior and Energy. The team calculated the production costs by assessing land area, water needs and fertilizer. They also analyzed greenhouse gas 4 .Producing pork, poultry, eggs and dairy were between two and six times less efficient than growing potatoes, wheat and rice. And in the current 5 system, beef uses 28 times more land, 11 times more water and six times more fertilizer than the average of the other categories of livestock. Cattle ranching also creates five times more greenhouse gas emissions.The researchers hope this data will help consumers make informed choices and policy makers create systems that can reduce the environmental costs of what we eat.