Ok a couple of gardening tips.
I used to have a new garden that was untouched ground and had the thickest weeds ( really it was like 'The Day of the Triffids) and stoniest ground you could imagine. I didn't want to use a really strong weedkiller (like sodium chlorate) that kills everything but means you cant grow anything for years so i did this. I got hold of a old all wool ( not foam backed) carpet that someone was throwing out. Strimmed the weeds level to the ground and laid the carpet (top side down) over it. Then i planted potatoes through the carpet and waited. The weeds can't grow back, the potatoes grow strongly cos there's no competiton, they dont need earthing up cos the capet covers em and when you dig the pots up you break up the ground and can remove stones at the the same time. After a few years the carpet breaks up and rots down and by that time you should have a good, stone free soil to grow super veg and flowers ( or a lawn on). Good for allotments too.
Back to the toilet ( or rest room as you americans so coyly put it). Gardeners know that the best way to activate the compost heap is to use diluted wee wee ( how coy is that). I wont say what the Chinese do with the solid stuff ( no they don't eat it) but really we should do trhe same at a local level. Such an abundbant, readily available fuel resource shouldn't be wasted.
I'm not really a gardener i just like to think of how we can reuse things.
I'm sure everone knows the trick of cutiing through an old car tyre ( still on the wheel) and inverting it to make a plant tub. You can paint it or slap a cement/soil mix on for a natural look.