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“Physical barriers such as fences and walls now line 32,000 kilometres of borders worldwide with significant increases over the past few decades. According to one recent study, nearly 700 mammal species could now find it difficult to cross into different countries, thwarting their adaptation to climate change. The fragmentation of populations and habitats means reduced gene flow within species and less resilient ecosystem”
“Physical barriers such as fences and walls now line 32,000 kilometres of borders worldwide with significant increases over the past few decades. According to one recent study, nearly 700 mammal species could now find it difficult to cross into different countries, thwarting their adaptation to climate change. The fragmentation of populations and habitats means reduced gene flow within species and less resilient ecosystem”
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