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Cities are responsible for over 70 percent of global greenhouse gas emissions and 75 percent of primary energy consumption. By 2050, over two-thirds of the world population will live in cities, resulting in even greater infrastructure needs and increased carbon emissions. Yet, cities largely remain on the sidelines in the design of national and international green transition policies. Cities can combine policy, practice, and participation by leveraging innovation, technology, and partnerships while transforming local governance models. There is a need for the G20 leaders to recognize and support the role of cities in accelerating climate action toward net zero and limiting warming to 1.5 °C. This Policy Brief suggests policy recommendations informed by current trends, Urban20 (U20) engagement group priorities, and previous communications by G20 countries to address the barriers that cities face in implementing effective climate action towards net zero. These recommendations emphasize on themes around empowering cities; building technical, institutional, and financial capacities of cities; facilitating climate finance; and enabling multi-stakeholder participation for achieving integrated urban climate action.