The zero impact emissions engine is an engine which, while it still produces emissions, produces such a low level that it has a minimum effect on air quality. If this is the goal of emissions regulations for marine, power generation, locomotive and automotive engines, then this goal is possible because the technology will soon be available. Past and present regulations are studied and emissions reduction methods are considered. From this it is predicted that the zero impact emissions engine will only be demanded in exceptional cases. Research and development will continue to reduce emissions but only at a rate which is economically acceptable.

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