Elmo and Abby find out it can be easy being green when they stumble onto the Earth-a-Thon, hosted by Mr. Earth. And it is all happening right on Sesame Street. Telly, Rosita, and Cookie Monster answer phone calls from children who are giving pledges to reduce, reuse, and recycle. See what happens when Abby uses her magic to help Elmo be really 'green.'

PET was a simple plastic bottle until nine-year-old Noboru Yamada recycled him. Now he's a super robot programmed to protect Noboru at all costs.