The volcano in the south pacific caused an increase in carbon output and a large amount of water vapor… water vapor is very much a greenhouse gas. Both factors were a rapid increase for both elements in the atmosphere.
Volcanos usually have a mitigating factor for both of these in particulates going up that reflect sunlight higher in the atmosphere. This one had a relatively low amount of that.
Timing wise, we’re on a high end of a natural heat cycle… then add in human activity… then add on a spike from a particularly impactful volcano.
tl;dr; Worst type of Volcano for global temperatures happened in an already expected hot year… before even getting into human effect.
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