Iowa Senator Chuck Grassley is expressing regulatory concerns on farms from emissions as outlined in a Climate Action Plan released by President Obama. He says he’s written a letter to EPA Administrator Gina McCarthy containing questions about that plan and its effect on agriculture.

Grassley says farmers and ranchers are worried EPA may go too far with these regulations as they tried to earlier with cap and trade rules.

Grassley says many are skeptical about regulating greenhouse gases unless it’s done through a global treaty.