The last 2 years have been unusually warm due to water vapor from the January 2022 Tonga eruption, which increased atmospheric water vapor by 10%. Water vapor is the dominant greenhouse gas on Earth and much stronger than CO2.

https://en.wikipedia.org/wiki/2022_Hunga_Tonga%E2%80%93Hunga_Ha%CA%BBapai_eruption_and_tsunami

https://www.nasa.gov/earth/tonga-eruption-blasted-unprecedented-amount-of-water-into-stratosphere/