Population 2 190 327 people
Density 20 781 habitants/km2
Surface area 105 km2
hectares covered with green spaces, or 17.5% of the surface area of Paris
100,000 street-lining trees
500 parks and gardens
556 hectares of public gardens
44 hectares of green walls and roofs
Considerable disparities with less than 1 m2 of green space per person in the north-eastern quarter and more than 10 m2 in the areas close to the Bois de Vincennes and the Bois de Boulogne.
wild species and 637 plant species
100% of people are less than 1 kilometre from a fast and regular network, according to the ITDP rankings.
With this result, Paris reached the 1st place in the rankings compiled by the ITDP.
By 2025, there will be a 100% clean bus fleet with all bus depots converted to biogas and electricity.
With more than 15,000 species of wild animals, the city of London, was awarded the title of "the world's first urban national park". It also has 8,400,000 trees in 8,000 parks and 3.8 million private gardens, or nearly one tree per inhabitant.
By 2050, the GrowNYC project plans to make new york "the most sustainable city in the world". This program provides for 1 million additional trees by 2030 and a 35% reduction in greenhouse gas emissions by 2025.
To counter the decline in its biodiversity, Tokyo has been pursuing an environmental conservation policy since 2012, for example by developing ecological corridors between parks allowing different species to extend their habitat.