San Francisco Bay Coffee sells biodegradable K-cups (they call them OneCups). They're also cheaper than the official K-cups. The only catch is that they don't work on the new Keurig 2.0 DRMed brewers.
http://www.usatoday.com/story/money/business/2014/12/19/free...
[0]: https://en.wikipedia.org/wiki/Sega_Enterprises_Ltd._v._Accol....
http://en.wikipedia.org/wiki/Sega_Enterprises_Ltd._v._Accolade,_Inc.
Perhaps it's just HN screwing up the autolinking(not tried it myself - i'm not a K-cup user)