In the flurry of taking care of work, family, dead tree removal, and crawl space renovation I left two very large bins with attached lid full of grass clippings for a couple of months. I rediscovered them yesterday and when I popped the lid the smell of ammonia almost knocked me down. It was so strong I didn't get a good look at the state of the clippings. Doing basic research it looks like the grass clippings are in anaerobic decomposition. Most of what I found online were various versions of how this was not good and should be avoided at all costs. That ship has already sailed so would it be possible or advisable to add this to all of brown materials, e.g., fallen leaves, wood chips, cardboard that I have gathered for aerobic decomposition? Is there a better way to use these decomposing grass clippings?