Mount Tambora was even better. But sadly volcanic winters are temporary, but release a ton of CO2 and methane that just can cause later warming, not to mention acid rain from all the hydrogen sulfide and sulfur dioxide forming sulfuric acid in the atmosphere. Maybe we need a few in a row.
I know, the actual answer is a massive volcanic explosion akin to Krakatoa in 1883 that cooled the planet by 2.2 degress Fahrenheit.
Mount Tambora was even better. But sadly volcanic winters are temporary, but release a ton of CO2 and methane that just can cause later warming, not to mention acid rain from all the hydrogen sulfide and sulfur dioxide forming sulfuric acid in the atmosphere. Maybe we need a few in a row.