A 3 bin system would mean more traffic with more trucks on the road to collect the extra bin- is this a concern for you?
According to the LMCC 2009 Community Survey, waste collection and maintaining road surfaces are the 2 most important ranking services to residents. In terms of avoiding greenhouse gas emissions, a 3-bin system is not as effective as a 2-bin system. A 3-bin system produces approximately 160,000 tonnes more greenhouse gas than a 2 bin-system over a 30-year period (see Report on Waste Options page 113 in Library section of this site).
Something to consider with a 3-bin system is- there would be more traffic on our roads from more trucks collecting the extra bins, generating more greenhouse gases, and requiring more road maintenance. Is this something that concerns you?