This looks useful:
CO2scorecard.org. From their vision statement:
CO2 Scorecard Group aims to emerge as the world’s leading resource for CO2 emissions data and metrics, and an important node in the overall information architecture to support the climate management goals of countries, cities, corporations and the general public around the world. We are guided by our belief that modern internet technology and the increasing trend of open data initiatives by public and private organizations around the world make it possible to deliver meaningful performance analytics to a wide range of stakeholders who are interested in the inter-generational challenge of climate change.
Have a look, let us know what you think.