The Establishment and Demise of the Medieval Nordic Settlements on Greenland: The Role of Natural Climate Change
Submitted by JaneStockton on Thu, 2004-06-03 16:04
Comments on a site related to the study of global warming assert that Viking
records suggest current global warming is not caused by greenhouse gases.
The authors of the published commentary cite historians' claims that the
Vikings were able to colonize southern Greenland because of mild weather at the
peak of a medieval warm period as evidence that current global warming is
caused by the same factor as medieval global warming. Since that occurred at a
time before modern sources of greenhouse gases (such as CO2), the essay asserts
that these gases are excluded as causes of modern warming.
Many scientists believe that emissions by industrial nations of gases such as
carbon dioxide (CO2) into the atmosphere, plus methane that results from
large-scale animal agriculture, are responsible for current warming climatic
trends. This essay disputes that theory, and asserts that there must be
another, natural, cause.