Library to host Sustainable Ann Arbor, four once-a-month collaborative discussions on second Thursdays uniting U-M faculty, community organizers, local politicians and the public about sustainable efforts of the past, present and future. The first, focusing on Resource Management, is on January 12. All discussions, which run January to April, are 7pm at the Main Library, 343 S. Fifth Ave. 734-327-4200. www.a2gov.org/sustainability.