If someone from Carnegie Mellon wants to have fun, he or she should crunch the numbers and determine the size of the carbon footprint for the G-20 summit. These people flew here from all over the world; many thousands of law enforcement people were brought here; protesters drove here; traffic had to be rerouted around the events; and traffic was stopped to allow motorcades to pass, causing engines to idle for hours.
All in all, a pretty hefty carbon footprint from people who should be setting a better example.
I could see it if the technology to teleconference had yet to be invented. If they teleconferenced, they could meet as often as needed and save a ton of money and carbon emissions.