Climate Change skeptics? [ot]

Summary
The development and calibration of a solar-output model for climate are supported by geophysical, archaeological, and historical evidence from the last full glacial Pleistocene (30,000 years BP) through the current Holocene interglacial to the present. The solar-output model is based on a superposition of a fundamental harmonic progression of cycles beginning at 10 and 12 years and progressing to the 13th harmonic (90,000-year cycle), which is approximately equal to the average continental glacial cycle. This model was date calibrated to the Pleistocene/Holocene boundary at 9,000 years BP and compared with geophysical records of sea level, carbon-14 production, oxygen 16/18 ratios, and other geologic evidence of climate fluctuations. The approximate 1,300-year little-ice-age cycle and intervening warmer periods agree with archaeological and historical evidence of these cold and warm periods. Throughout history, global warming has brought prosperity whereas global cooling has brought adversity.

The solar-output model allows speculation on global climatic variations in the next 10,000 years. Extrapolation of the solar-output model shows a return to little-ice-age conditions by A.D. 2400–2900 followed by a rapid return to altithermal conditions during the middle of the third millennium A.D. This altithermal period may be similar to the Holocene Maximum that began nearly 3,800 years ago. The solar output model suggests that, approximately 20,000 years after it began, the current interglacial period may come to an end and another glacial period may begin.