The amount of energy difference is huge and I don't think that many people would argue that they don't have a significant impact on the global temperature in the short run. (realclimate.org)
The warm and cool regions roughly balance each other out with little impact on global temperature. (skepticalscience.com)
For example, some scientists have studied the climate response to recent large volcanic eruptions, which can have a measurable impact on global temperatures. (skepticalscience.com)