On 21 Apr 2007 16:27:24 -0700, Cato wrote:

Like I said, what about the Medieval
Warm Period when the world was warmer then now. Tell me what caused
that. Or the Little Ice Age from approx. the 1400's to the mid 19th
century. What caused that?

2.3.3 Was there a ''Little Ice Age'' and a ''Medieval Warm
Period''?

The terms ''Little Ice Age'' and ''Medieval Warm Period'' have been
used to describe two past climate epochs in Europe and neighbouring
regions during roughly the 17th to 19th and 11th to 14th centuries,
respectively. The timing, however, of these cold and warm periods has
recently been demonstrated to vary geographically over the globe in a
considerable way...

http://www.grida.no/climate/ipcc_tar/wg1/070.htm