My zip code is greener than your zip code.

Soon enough, San Francisco residents will be able to engage in debates like these, thanks to the "Urban EcoMap" being launched by Cisco Systems.

The map, developed with the City and County of San Francisco's Department of the Environment, will give people free insight into data such as carbon emissions from transportation, energy use and waste, broken out by zip code — once it's available to the public on May 21.

(While Cisco chose Earth Day to announce the map, San Francisco Mayor Gavin Newsom let slip some details about it last month at the Green:Net 09 conference.)

Beyond the potential for sparking inter-neighborhood battles over which ones are helping save the planet the most, such a tool could be quite useful for neighborhood greening efforts, whether from the grassroots or from the top down.

Cities could target particular neighborhoods for energy reduction incentives, recycling programs or public transportation improvements, for example. And residents will be able join in forums over any Internet connection to tell each other what they're doing to help reduce their neighborhood's carbon footprint, Cisco promises.

The project is part of Cisco's Connected Urban Development program, created in 2006 in partnership with the Clinton Global Initiative, aimed at reducing cities' environmental impacts. Seoul and Amsterdam are set to launch their own eco-maps later this year.