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HOW TO ADDRESS THE CHALLENGES OF CITIES?
EN 
FR Cities
HOW TO ADDRESS THE CHALLENGES OF CITIES?
Towards Sustainable Cities. Urbanization profoundly impacts the Earth system, causing habitat loss, deforestation, changing species interactions, and even unbalancing the water cycle.
- 55% of the world’s population lives in urban areas, although cities represent only 2% of the Earth’s surface. This proportion is expected to increase to 68% by 2050 – an additional 2.5 billion people.
- 60% of global greenhouse gas emissions are produced in cities.
- 78% of the world’s energy is consumed in cities, according to UN-Habitat.
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