The mayors of london and freetown are co-chairs of c40, with the mayor of london and the mayor of freetown recently making a statement at the who conference on air quality in cartagena, colombia. The statement appears to be part of a broader effort by c40, which has also been involved in other events such as the world mayors summit. The role of the mayors as co-chairs of c40 suggests they are playing a leadership role in the organization's efforts on climate and environmental issues.