without looking it up (i'm lazy tonight) gonna state you are wrong about the comparison of man's co2 to volcanoes.
Read what Armstrong wrote as quoted in my prior post. It is the ash, not the CO2 that matters.
The ash and particulate from volcanoes creates a 2-3 year cooling effect which can be world wide. however, this is not a permanant change.
Climate, the phrase, refers to weather conditions over 10 year periods. A volcano can indeed change the numbers of a decade. But the next decade will be back to "normal." The problem the Warmers have with the trace gas CO2 is that it sort of stays in the atmosphere and accumulates. Thus, ignoring the logarithmic decrease in response for each doubling of Co2 in the atmosphere, they cry alarm.
A true "supervolcano" such as that supposedly under Yellowstone, is a different matter.