YUMSUGAR: Chipotle’s furthering its quest to create a more sustainable fast food system. Today the quickservice chain unveiled its new nonprofit organization, the Chipotle Cultivate Foundation, to help support sustainable food practices. It’s also debuted a short animated film, which will air prior to feature films in theaters nationwide. The spot, titled “Back to the Start,” is about a fictional farmer’s venture into industrial farming practices and his eventual return to a more sustainable way of life. For the short, Chipotle commissioned Willie Nelson to sing Coldplay’s “The Scientist.” The cover song is available for download on iTunes, with proceeds […]