Sen. Mike Johanns' concerns center on a proposal known as cap-and-trade, which would cap carbon emissions for various industries. Industries that would need to exceed the cap would buy credits from other industries that emit less than the allowance.
The Obama administration has said the benefits of the program would outweigh the costs for agriculture.
But Johanns says he wants more than the administration's word. Johanns has asked the U.S. Agriculture Department to provide state-by-state and crop-specific analyses. He also wants an analysis of the proposal's effect on livestock producers.
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