Studies by Ohio caver Greg Springer as well as colleagues
from UT Arlington and elsewhere have shown that Native Americans were
actively burning forests and contributing significant carbon dioxide
to the atmosphere well before the arrival of European
settlers: <http://www.physorg.com/news190561417.html>,
<http://news.discovery.com/earth/native-americans-carbon-emissions.html>.
Part of the evidence comes from caves in West Virginia.
Mark Minton
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
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