Abstract

Here the authors critically review the IPCC’s claim that global warming is “very likely” caused by human activity: such a
description underestimates the likelihood of the warming being due to this mechanism. Next examined are known alternative “natural”
mechanisms which could give rise to the warming if, despite many claims, the man-made explanation was false because of
compensation effects (greenhouse gases versus aerosol effects). Also, a number of difficulties, as yet unresolved, in the human-induced
warming explanation are considered.