31 European cities make green pledge and signed up to the C40 cities network goal of having 30-40 per cent of built-up city surface consisting of green spaces like parks or streets lined with trees, or permeable spaces to absorb water and prevent flooding. Other commitments include improving access to these green spaces for locals. The C40 network connects these cities, allowing a sharing of knowledge and ideas and helping them to achieve their climate goals. The following cities signed up to the declaration: Athens, Austin, Barcelona, Berlin, Bogotá, Buenos Aires, Copenhagen, Curitiba, Durban, Freetown, Guadalajara, Haifa, Lima, London, Los Angeles, Medellín, Milan, Mumbai, New Orleans, Paris, Quezon City, Rio de Janeiro, Rome, Rotterdam, Salvador, Seattle, Stockholm, Sydney, Tel Aviv, Tokyo and Toronto. https://www.euronews.com/green/2021/07/13/3-million-trees-and-roof-top-gardens-european-cities-in-green-pledge https://www.c40.org/