by B. Irvine, May 17, 2021 in WUWT

A knowledge of Greenhouse gases is fundamental to any understanding of global surface temperatures. The presence of GHGs in our atmosphere has increased the global surface temperature by about 33C.

There are multiple lines of evidence, however, that challenge the strong water vapour feedback to a small initial CO2 forcing.  These strong positive feedbacks are central to the IPCC narrative.

These lines of evidence include.

• The failure of all models and catastrophic warming projections.
• The stubborn refusal of atmospheric Precipitable Water Vapour (PWV) concentration to rise in recent years.
• The strength of convection cells in the tropics that have kept tropical temperatures approximately the same for many millions of years.
• Irrigation and extra humidity generally coincide with cooler temperatures.
• The hot spot as a signature of the positive Water Vapour (WV) feedback and its opposite, the negative lapse rate feedback, has not occurred.

INTRODUCTION

…