Mowing the grass does not seem to me to be distruction of the environment.
It might be painful for the grass but no one else seems to mind. ;-)
It would be nice if it recycled the grass clippings instead of creating
more landfill waste (A mutant mulching mower) :-o.
Essentially it won't flip over and leak gas and/or battery acid into the
sewer or creek. Does not consume excessive amounts of electricity or fuel.
Does not belch polution from a baddly tuned weedwacker.
Does not dig up the grass and cause soil erosion.
This is kind of covered in other goals but not specificly called out.
Ron