Lawn mower engines have not been subject to the same emission-control regulations as cars, according to the U.S. Environmental Protection Agency. Yard work has therefore played a significant role in the formation of ground-level ozone due to mower emissions of carbon monoxide, hydrocarbons, and nitrogen oxides.
Sweden-based firm Husqvarna's solution is the Automower Solar Hybrid, the world's first automatic lawn mower partly powered by sunlight.
On sale this year, the unit can cover up to 22,600 square feet (2,100 square meters), and can even tackle slopes.
The hybrid helper operates for up to an hour on a 45-minute battery charge--longer if it's sunny--before returning to its charging station. The only things it emits are grass cuttings.
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Photograph courtesy Husqvarna