At least 70% of global CO2 emissions are connected to city living. The greener a city is, the more carbon dioxide is absorbed and oxygen produced. Trees and plants also help regulate the temperature.
President Vladimir Putin has called for compromise after an outcry over plans to build a cathedral in a park in Russia's fourth-largest city. Locals have protested, saying the building would take away rare green space.
Berlin attracts more nightingales than almost any other European city. Although it's not an urban species, the little bird with the big voice seems to thrive in Germany's hectic capital.
What do urban kids, picnic lovers, animals and bees have in common? They all need nature to be happy. A learning pack about the discovery and creation of green oases in the city.
Electric cars have outsold traditionally-fuelled vehicles for the first time in Norway. The nation, whose capital has been named European Green Capital 2019, wants all new vehicles sold to be electric by 2025.
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