One hour of power-mower use emits about the same amount of polycyclic aromatic hydrocarbons as driving a car ninety-three miles!

Using a gas-powered leaf blower for half an hour creates as many polluting hydrocarbon emissions as driving a car seventy-seven hundred miles at a speed of thirty miles per hour.

A man weighing a hundred and eighty pounds burns nearly five hundred calories pushing a non motorized reel mower around the yard for an hour.