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Guido makes a
very useful point; whatever it is that causes changes in 'our
time', they are very rapid by 'usual' geological rates. The rate at which species are becoming extinct is considered by some to be about the same as at the famous K/T (Cretaceous / Tertiary) mass extinction of 65 million years ago. And we look back at that as one of Earth's major 'catastrophies (although we exist probably because of it!) By the same token, many of us, especially those who should be planning- beyond the lifetimes of their voters (how to be elected eh?), seem to imagine that any deviation from the 'normal' (ie., human experience) set of conditions is necessarily unnatural. Yet nother problem is that of the casual language used for popular communication; greenhouses don't warm up mainly by a greenhouse effect which is really a misnomer! Global warming is another - adding energy to Earth's atmospheric system doesn't necessarily mean that everywhere will get warmer. Indeed, perversely, it could trigger a glaciation for we northerners. John Stanley ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, April 27, 2006 11:05 PM Subject: Orchids Digest, Vol 8, Issue 151 |
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