Thank you for that info. This is a confusing subject, since in my understanding, sometimes the greenhouse gases reflect the sunlight and reduce heat entering earth's atmosphere and other times the gases insulate the atmosphere and keep the heat circulating within it. I hope that's right? It is really frightening to consider that natural events have produced far more of the stuff than man has to date. Especially when you consider the amount of man made CFC's released into the atmosphere daily. I have no idea what that specific amount is, but according to your post, all combined man-made greenhouse gases are far less than the single Krakatoa eruption.

So, if this eruption hadn't have happened, would the earth be even warmer currently, had it not already been abnormally cool at the start of the industrial revolution?