Somewhere around 50% of American's start their day with a mug of it, but I would guess that 99.9% of those consumers make waste of it's remnants while thriving on their morning-time caffeine rush.
Packed full of Nitrogen, Phosphorus and Potassium, coffee grounds can be tilled into compost, garden beds or even interior plant pots. This organic amendment will help stimulate beneficial microbes in the soil, but also act as a natural pesticide. Slugs, snails and pillbugs are deterred by caffeine, so spread your grounds throughout the garden (2-5 lbs/ 1000 sf) and reap the rewards of your recycled and organic fertilizer/ pesticide.
Don't be alarmed if you see some green or blue-green fungal growth, it is actually a beneficial fungus for the microbial activity.
Not part of the 50%? Me either... but bring a box to your workplace every day to collect your coworkers grounds, or ask your local donut shop for any before they throw it out.
What do you recycle into your garden/ compost on a regular basis that most people just throw in the trash?