Up to one fifth of all warming reported across the planet by around 20,000 weather stations is invalid due to corruption from non-climatic data. This finding is the latest revelation from two atmospheric scientists seeking to measure the effect of human-caused urban heat on global surface temperature measurements. The news is sensational because it depresses further the major slowdown in warming observed since around 1998. With the global temperature warming by little more than 0.1°C over the last two decades, it makes claims of 4°C warming by the end of the century seem even more implausible.
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