Some of the world’s biggest cities are so polluted they’re warming slower

But this surprising effect of pollution should hardly be taken as a good sign.

The question of whether global warming is accelerating is hotly contested among climate scientists. While some have argued that the current rate of warming — which hit an all-time high last year — is strictly correlated with increased fossil fuel emissions and therefore aligned with current climate models, others have cautioned that the Earth is far more sensitive to fossil fuels than previously thought and that humanity is hurtling toward tipping points from which there can be no return.

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