Monday, October 09, 2006
Even more to worry about
Cataclysmic Events as reported in the October issue of Scientific American may indeed be exacerbated by mankind's poor stewardship of the Earth.
New geochemical evidence is coming from the bands of stratified rock that delineate mass extinction events in the geologic record, including the exciting discovery of chemical residues, called organic biomarkers, produced by tiny life-forms that typically do not leave fossils. Together these data make it clear that cataclysmic impact as a cause of mass extinction was the exception, not the rule. In most cases, the earth itself appears to have become life's worst enemy in a previously unimagined way. And current human activities may be putting the biosphere at risk once again.
How long have we got? How long have these two Cape Petrels got?