It has long been suspected that the low solar activity during the Maunder Minimum was one of the causes of the Little Ice Age, although other factors like a small drop in greenhouse gas concentrations around 1600 and strong volcanic eruptions during that time likely played a role as well. (realclimate.org)
Extreme natural forces, such as strong volcanic eruptions, were shown to disrupt climate trends for decades. (sciencedaily.com)
Even strong volcanic eruptions such as Pinatubo, El Chicon and Agung had little discernable impact on CO2 levels. (skepticalscience.com)