Can’t find the link back but I read before that volcanic
eruptions are a major problem.
http://www.en.wikipedia.org/wiki/Global_Warming
External forcingsExternal forcing refers to processes external to the climate system (though not necessarily external to Earth) that influence climate. Climate responds to several types of external forcing, such as radiative forcing due to changes in atmospheric composition (mainly greenhouse gas concentrations), changes in solar luminosity, volcanic eruptions, and variations in Earth’s orbit around the Sun.[31] Attribution of recent climate cha ...
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