[Yet another reason why the United States needs more biogas systems: to recycle nutrients from organic material rather than use conventional natural gas to produce synthetic fertilizers.] A disturbing new study from researchers at Cornell University and the Environment Defense Fund has independently measured methane emissions from a number of ammonia fertilizer plants. The startling results suggest methane emissions are 100 times higher than industry estimates, and three times higher than the Environmental Protection Agency’s estimate for all industry methane emissions in the United States. More >>