Via Billboard: Remember when Kermit the Frog used to say it wasn't easy being green? Those days are long gone. Green couldn't be more cool right now. Global warming is hot. As an issue, I mean. Not as a bad pun. One-time Eurythmic Dave Stewart has created a new song to celebrate Earth Day, appropriately titled "Go Green." It's a veritable Eurythmics reunion, as Annie Lennox lends vocal support on the track. But she's not the only dame to do so. Imogen Heap, Bonnie Raitt, Nadirah X, and Sarah McLachlan also guest on the track. It will be available on iTunes April 17.