Climate change poses real challenges for farmers working to feed and fuel a growing population, U.S. Agriculture Secretary Tom Vilsack said last week at a forum on climate change at Drake University. However, the former Iowa governor brushed off the idea that mandatory regulations should be imposed on farms.

Other speakers at the climate change forum hosted by the New Republic, along with the League of Women Voters and Drake, said regulations are needed to limit greenhouse gas (GHG)...