Global warming appears to have shifted into a faster gear. After removing the effects of El Niño, volcanic eruptions, and solar cycles, researchers found that the planet has warmed at roughly 0.35°C per decade over the past ten years, compared with just under 0.2°C per decade from 1970 to 2015. The acceleration, which becomes visible around 2013 to 2015, appeared across five major global temperature datasets with more than 98% statistical certainty.
They may be thinking of the half-life of C02, around 120 years … or the delayed effect of temperature uptake by the ocean. I’m not a clime scientist.
I edited in a reference - it’s a thing aparently