Beginning today, all C40 member cities are invited to report their climate data through our reporting partner CDP. The annual reporting cycle is designed to help cities report their data in a transparent way, and better track the impact of their climate actions. Reporting is also an important requirement for compliance with the Compact of Mayors. Within one year of committing to the Compact, a city must identify their climate risks, compile a city-wide greenhouse gas emission inventory according to the Global Protocol for Community-Scale Greenhouse Gas Emission Inventories (GPC), and report their data. CDP is an official reporting platform for the Compact.