Global warming and Global cooling are natural earth cycles. My eldest sister ask me my thoughts when G warming was the topic de jour. I ask her, do you think the last ice ages ended when neanderthals went around riding large flatulence producing mastadons instead of riding smaller, more grass efficient critters? Or, did it end through a natural cycle of warming? Europe has in the past heated and cooked the whole of the area with wood and coal for centuries past, has the snow stopped falling, the ice fields on Mt Blanc dissapeared, acid rain melted the buildings into the landscape? The planets temperatures rise and fall comensurate with earths, not to the extremes, but fluctuate they do. Do migrant spacemen inhabit these planets periodically as shown by the planets rises in temperature? Biologists a few years ago planted lynx hairs here in the northwest in a cheap attempt to get their beloved forests shut down to peoples access. Global warming and cooling, it just happens. In no way am I saying that man has not caused changes to our environment,I find it silly that man is so arrogant to think he has such a large impact on something so vast.