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What is the evidence for global warming
What is the evidence for global warming? The world is now
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nearly one degree Celsius warmer than it was before
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widespread industrialisation, according to the World Meteorological Organization (WMO). The 20 warmest years on record have all occurred in the past 22 years, with the years from 2015-2018 making up the top four. The WMO says that if the current warming trend
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continues, temperatures could rise by 3-5C by the end of this century. A threshold of 2C had long been
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regarded as the gateway to dangerous warming. More recently, scientists and policy makers have argued that keeping temperature rise to within 1.5C is a safer limit for the world. But an IPCC report in 2018 suggested that keeping to the 1.5C target would require "rapid, far-reaching and unprecedented changes in all aspects of society".