Environmentalists support fighting pollution by finding alternative-energy sources for small engines, not just focusing on cars and trucks. But it's not clear that consumers are willing to pay
more for greener small engines, or that they will change their fueling habits.
The industry is under pressure to cut emissions. The Environmental Protection Agency has proposed rules that would require 35% cuts in hydrocarbons and nitrogen oxide for lawn mowers, personal watercraft and other equipment powered by small engines.