Sam says: When I saw these mugs on-line, I was so excited. There are 4 eco-positive aspects: (1) They are made in the USA (less shipping of stuff from China, and the money goes to U.S. Workers). (2) They are made from corn instead of oil. (3) They will return to natural mush, when thrown away. (4) You can stop getting coffee in paper cups, Starbucks and most other places will fill this for you ! (5) Not only is it made in the USA from Corn, but I am told many coffee shops give you a discount when you bring your own mug. 7/11 gives one friend her coffee for $1 instead of $1.82. That saving is gonna pay for her mug pretty quickly!!! : )