CAFO

Scott Bauer / U.S. Department of Agriculture

There are thousands of concentrated animal feeding operations, or CAFOs, around the United States, but no one knows the exact number.

Two Stanford University professors published research this week in the journal Nature Sustainability, saying there’s an easy way to count CAFOs: Teach a computer to do it for them.

File: Grant Gerlock / Harvest Public Media

Story, headline updated Nov. 22 with ruling — A U.S. appeals court has agreed to the EPA's request for more time to implement the emissions-reporting requirement. The mandate will now go into effect on Jan. 22.