Single serve coffee makers are great, convenient, and awesome in that you can use a different flavored k-cup every time. You aren't stuck to using the same flavor coffee until you replace the bag. But that is a lot of k-cups to throw away. Even if you just drink one cup of coffee each morning that is 365 a year that are thrown away.
So what can you do with those k-cups?
Here is one idea:
Use for starting small seedlings:
Perforate the bottom of the k-cup. Place in a tray of sand. Fill with soil and place one seed into each pod.