A report by C40 and the McKinsey Center for Business and Environment, Focused Acceleration: A Strategic Approach to Climate Action in Cities to 2030 details the biggest opportunities for emissions reduction, making it easier for cities to identify actions with the potential to deliver the greatest emissions reductions by 2030.

The world is spending only $3 trillion a year on infrastructure, half of the $6 trillion a year required from 2015 to 2030.