On 2/4/07, Manfredi, Albert E <albert.e.manfredi@xxxxxxxxxx> wrote:
Bob Miller wrote: > The next change of Earth polarity could get stalled in > neutral for a couple of million years while we all watch > Auroras at all latitudes and the Solar wind blows our > atmosphere away. I don't think anyone has suggested that anything we do causes, or could avoid, a magnetic pole shift, Bob.
Nor did I suggest that anything we do causes magnetic shifts Alfred. I only suggest that it is our job to TRY to do whatever we can to survive whatever comes our way.
And these shifts apparently occur at wildly different intervals, as close as 10s of thousands of years apart to as far apart as a million years apart. And they take varying amounts of time to complete, as far as we know now. So if life has survived them in the past, chances are it will do so again. Although, of course, maybe not life as we know it now. Scary stuff, but again, no one is saying we can do diddly about it.
So what is your point? I am only saying that it is our job to try to first find out the history and mechanisms that govern our world and then to do our best to live with and survive them. That is what we are, problem solvers of problems related to survival.
If the last shift occurred 780,000 years ago, as apparently is the case, mammals already existed, even homo erectus already existed. They muddled through somehow. Apparently, it is the lack of magnetic poles that turned Mars into the barren planet it is. Another point. The shifting poles do not mean that there will be no magnetic field at all. What seems to happen is that the magnetic field changes in different locations, shifting around, reorienting itself. In some specific locations, it may disappear entirely for a time. And then eventually it is mostly all reoriented. I'm not sure what this means to us, but there are already now places where the magnetic field is screwy. My optmistic hope is that the reorienting fields will still protect us, even if they do not all line up nicely, as long as these fields exist.
But like you said above they may disappear for some time, an unknown period of time, during which the Solar wind is free to strip us of our atmosphere among other unpleasantries. That is all I said, all I meant was an illustration of things we have to deal with that relate to adaption and survival, we not the world. The world is oblivious to such things. Bob Miller
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