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[timelets]

The latest study, which draws on satellite temperature records from 1979 to 2016, is the first to pinpoint seasonal changes in the atmosphere. The odds that natural climate variability can account for the magnitude of the temperature changes over the course of the satellite record are roughly five in a million, researchers report on 19 July in Science.

Some seasonal climate trends cannot be explained without including warming caused by rising atmospheric greenhouse-gas concentrations, the scientists found. The most significant change was in the northern hemisphere, where the difference between summer and winter temperatures has increased by around 0.4 °C, mostly due to the fact that summer temperatures are rising more quickly.

https://www.nature.com/articles/d41586-018-05780-z