"C40 is a network of the world?s megacities committed to addressing climate change. C40 supports cities to collaborate effectively, share knowledge and drive meaningful, measurable and sustainable action on climate change... Cities are where the future happens first. The C40 Cities Climate Leadership Group, now in its 10th year, connects more than 80 of the world?s greatest cities, representing over 600 million people and one quarter of the global economy. Created and led by cities, C40 is focused on tackling climate change and driving urban action that reduces greenhouse gas emissions and climate risks, while increasing the health, wellbeing and economic opportunities of urban citizens."