More factory farming but oversight lags Some huge livestock farms produce more raw waste than cities as large as Philadelphia or Houston. But federal regulators are failing to control pollution from the gigantic operations or assess health risks from the enormous quantities of manure they produce, according to congressional investigators. The Government Accountability Office report on the raw waste is to be released Wednesday to a House committee hearing on federal oversight of factory farms. The conclusions fueled concerns about a proposed Environmental Protection Agency rule change that would eliminate one of the few federal oversight mechanisms over air and water pollution from big farms. The rule would eliminate a requirement that farms report to federal, state and local officials when air emissions of hazardous substances like ammonia and hydrogen sulfide exceed certain levels. EPA proposed the rule change in December, contending the requirement created an unnecessary burden for farms and that the emission release reports usually weren't needed or acted upon....