Keith Hunter’s statement asserts: The evidence pointing towards AGW comes from multiple independent lines of argument, each pointing in the same direction. … a few examples follow.
This is his first example:
It is a plain fact that human activities have significantly increased the concentrations of greenhouse active gases in the atmosphere, particularly since the mid-20th century.
Who will tell him that nothing could be further from plain? What does he mean by “greenhouse active gases”? Does he mean that water vapour has increased in the atmosphere? Does he include methane? Nitrous oxide? Or does he only mean carbon dioxide?
Does he exclude the possibility that increased temperature has driven more carbon dioxide from the oceans into the atmosphere?