Single Serve Coffee not Sustainable?

Just the other day I was knocking a single serve coffee machine at the workplace for the amount of waste produced and how you can't use your own mug. Surprisingly some of these machines may be looking into sustainable options. One of the single serve companies, Flavia, has a sustainable component to their website to detail their steps to energy reduction and partnerships with Certified Rainforest Alliance coffee and TerraCycle to help with recycling. Maybe they aren't as bad as we initially thought?