I don't think that is anywhere near true
That is the whole problem, most Greens obviously do not think. It is a basic fact. Think about it. One volcano pumps out thousands of tons of material directly into the upper atmosphere.
Kracatoa blew up and the year 1776-1777 was known as "the year with out a summer" because it effected globally the world's weather patterns. Not a "gradual centuries long change" of the Hysteric Leftists but a direct world wide change within months of the eruption. The facts are NOT on the side of the Environmental Wackos with their Socialism in drag "green" dogma.