evidence: During an El Niño, warmer surface waters in the eastern Pacific release additional heat into the atmosphere. This typically leads to a surge in global air temperatures. [...] The ongoing 2023 El Niño may be releasing even more warmth than previous ones, because the world had previously been in an extended cool phase - an opposite weather system known as La Niña. [...] They suggest that the climate is yet to fully respond to the greenhouse gases already emitted. One reason could be the artificial cooling effect of aerosols. This leaves more warming "in the pipeline" than previously thought, they argue.