The C40 Cities Climate Leadership Group, a partner of the Global Cool Cities Alliance, has just released a report on the efforts of member cities to reduce greenhouse gas emissions.  The report updates information gathered from member cities in 2011, and shows that the mayors of 63 of the world’s largest cities have taken nearly 8,000 actions to address climate change over the past 2 years.

You can read more about it in C40’s report here:
Climate Action in Megacities, Volume 2.0.