I have often wondered why some engineering type hasn't developed a methane lawnmower "system"...you would mow the grass, put the clippings into a special container that would trap the methane as the clippings decayed, then you would plug your mower into the system to fuel it up with the methane. Then the clippings would be compost.

Your garden looks lovely! We're finally getting some rain here, so things are starting to take off..mostly weeds *HA*