Climate conference in Copenhagen is started

Today the climate conference in Copenhagen is started. 15000 people are traveling to the capital city of Denmark from 190 countries. How many CO2 emission will that cause? Has anyone calculated that? I hope that everyone is aware of that fact. If they are succesful in Copenhagen then there is no issue. But if there are no results that helps our planet, then it was a waste of time, money and clean air.
Check for more info the official site.