Around one-third of the world's economy by 2025 will be based in countries at "high" or "extreme" risk from the economic impact of climate change, according to risk consultancy Maplecroft.

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Thirty-one percent or $44 trillion of output will be based in countries classified as most at risk from climate change in Maplecroft's Climate Change Vulnerability Index, which considered a nation's exposure to extreme weather events over the next 30 years alongside its capacity to cope with the impact.

"Future projected changes in the frequency and intensity of forest fires, severe weather events, droughts and flooding will affect the population, economy and infrastructure of a country. The effects of rising temperatures, shifting rainfall patterns and rising sea level will also be felt globally, impacting coast lines, plant and animal species, agriculture and human health," the consultancy said in a report on the index published on Wednesday.

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