I'll give you a list of six things: energy efficiency in buildings; energy efficiency in lighting, particularly street lights; alternative fuels for municipal fleets; purchasing renewable energy, as opposed to fossil energy; and landfill gas and methane recapture in landfill operations in municipalities. Those are probably the most popular low-hanging-fruit methods of attack when it comes to GHGs.
On February 26th, 2007. See this statement in context.