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Half of humanity lives in cities, and in 2050, it will be two thirds. Making these cities more secure, inclusive, resilient and sustainable is a matter of urgency. Cities within biosphere reserves have protected areas nearby, which provide fresh air and recreation, as well as a number of other ecosystem services (e.g. pollination, water quality, CO2 storage, etc.). They also mean additional economic opportunities, in ecotourism for example. 
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