Estimates vary wildly, but its likely Americans burn more than 600 million gallons of gasoline a year cutting the grass. Hell, the EPA estimates at least 17 million gallons of gasoline are spilled annually just filling lawn mowers.
In 2009, according to the Consumer Product Safety Commission, 86,000 injuries involving lawn mowers required a trip to the emergency room; in 6,400 of these cases the victim was dead on arrival or wound up hospitalized. The CPSC estimated in 2003 that lawn mower accidents cost us $5.4 billion per year.
But perhaps you remain blasé. Who needs all those toes? OK, one last point:
In a time of dwindling water supplies, somewhere between a third to half of residential water use is for lawn and garden irrigation, and about half of that water is wasted by poor watering practices.
I use a push-reel mower and we never water our lawn.