We are still in the midst of running a dangerous experiment on Earth’s climate system, and we get to periodically check in on the results—like laboratory rats peering at the graphs on a whiteboard across the room. And it’s that time again.

Every year, global temperature can be compared to the predictions born of the physics of greenhouse gases. A number of groups around the world maintain global surface temperature datasets. Because of their slightly differing methods for calculating the global average and slightly differing sets of temperature measurements fed into that calculation, these datasets don’t always arrive at exactly the same answer. Lean in close enough and you’ll see differences in the data points, which can translate into differences in their respective rankings of the warmest years. The big picture, on the other hand, looks exactly the same across them.

Källa: 2021 obeyed physics, was one of the warmest years on record

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