In this photo taken Nov. 24, 2010, a Case IH Magnum tractor is shown on the assembly line at the CNH Tractor Plant in Mount Pleasant, Wis. The tractor contains a diesel engine that is already ... more 
In this photo taken Nov. 24, 2010, a Case IH Magnum tractor is shown on the assembly line at the CNH Tractor Plant in Mount Pleasant, Wis. The tractor contains a diesel engine that is already compliant with federal Tier 4A emission standards, which take effect in 2011. less 
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Associated Press | Photo By Journal Times, Scott Anderson
Wed, Jan 5, 2011 10:00 AM EST