New York and Toronto have a lot in common, including the complexityof reducing waste generated in multifamily buildings. Almost half of Torontonians live in apartments, and this group recycles and composts in significantly lower numbers than those in single-family homes. Communication is particularly challenging because a third of residents are immigrants and numerous languages are spoken. In 2009, Toronto launched a program inviting interested residents of multifamily buildings to become 3Rs (reuse, reduce, recycle) ambassadors. Case Study pdf.