At the 2016 International WorkBoat Show in New Orleans, the coming year's onset of tough new Tier 4 emission standards for diesel engines hung over everyone's head. Literally, as in the Rolls-Royce floor display of a selective catalyst reduction (SCR) exhaust gas aftertreatment system, a lime-green box looming over an MTU 4000 series engine. And Tier 4 was on many show visitors' minds, with panel sessions on the engineering tradeoffs forced by the U.S. Environmental Protection Agency's long campaign to reduce diesel emissions.
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