WWF’s One Planet City Challenge (OPCC) is a friendly competition celebrating cities that are national and international frontrunners demonstrating ambitious climate actions. WWF will assess the alignment of cities’ climate actions, plans and targets with their fair share of the Paris Agreement and its goal to limit global warming to 1.5 °C. Cities wishing to participate in the One Planet City Challenge (OPCC) are invited to report their climate ambitions through CDP-ICLEI Unified Reporting System. This webinar will address the rationale, design, process and timeline of the initiative as well as how to use the reporting platform and successfully submit data to the OPCC.