The environmental non - profit CDP has published its first - ever ranking of cities ’ responses to climate change . A top level “ A ” rating has been awarded to 43 of the 596 cities ranked , including Barcelona , Cape Town , Hong Kong , London and Paris . CDP also cited 14 cities , including Boston , the Hague and Sydney , which aim to be climate or carbon neutral by 2020 . Several cities , including London , Paris and San Francisco , have 100 % renewable energy targets , while Reykjavík has already achieved this goal . Cities house over 50 % of the global population and are responsible for over 70 % of energy - related carbon emissions .
Leading environmental non-profit CDP has produced its first-ever ranking of cities’ responses to climate change. A top level “A” rating has been awarded to 43 of the 596 cities ranked, including Barcelona, Cape Town, Hong Kong, London and Paris. CDP also cited 14 cities, including Boston, the Hague and Sydney, which aim to be climate or carbon neutral by 2050. Five cities, including Canberra, Paris and San Francisco, have 100% renewable energy targets, while Reykjavík has already achieved this goal. Cities house over 50% of the global population and are responsible for over 70% of energy-related carbon emissions.