Tougher clean-air standards from the U.S. Environmental Protection Agency have prompted manufacturers of mowers and other outdoor power equipment to start working on green initiatives. For example, Jacobsen, a Textron Company in Charlotte, N.C., has offered battery electric-powered greens mowers that eliminate hydraulic oil and cut pollution. Current emissions standards include U.S. EPA Tier 4 for diesel and U.S. EPA Phase 2 for gasoline, but more could be implemented.

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