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This paper shows the vital role of cities in climate governance, as places where the crisis is expressed in latent form, but also as emblematic spaces in terms of technological innovation and social empowerment. It discusses challenges of megacities like Rio de Janeiro, given their vulnerability, resilience and environmental risks to the transition of a more intelligent and sustainable patterns of urbanization, through its domestic policies and paradiplomacy networks. ResumoEste artigo mostra o papel vital das cidades na governança do clima, como lugares onde a crise se expressa de forma latente, mas também como espaços emblemáticos em termos de inovação tecnológica e empoderamento social. Discute os desafios de megacidades como Rio de Janeiro, considerando suas vulnerabilidades, riscos socioambientais e resiliências para a transição de modelos mais inteligentes e sustentáveis de urbanização, através de suas políticas domésticas e redes de paradiplomacia.