Cities threatened by desertification

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Land degradation and climate change are speeding up the planet desertification process. What is this phenomenon and what regions is it affecting? What are the causes?

How cities are protecting themselves from tornadoes

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Increasingly common extreme storms are wreaking havoc in cities, putting the lives of millions of people at risk. Phenomena like tornados, for example, generate devastating losses each year all around the world. Can architecture combat their effects?