Renowden has no evidence for CAGW

Jo Nova's take on the lack of evidence for AGW

This is in response (slightly delayed by an Easter break) to the list of “proofs” produced by Gareth Renowden, at Hot Topic, in answer to my request of Sir Peter Gluckman, the PM’s scientific advisor, for evidence of a human cause for anticipated dangerous climate change, more properly referred to as the catastrophic anthropogenic global warming (CAGW) theory.

On 17th April, I wrote:

I would remind Sir Peter that evidence is required to establish the following key factors in the global warming debate — evidence that has not surfaced so far. We have been looking for evidence to show:

1. The existence of a current unprecedented global warming trend.
2. That the greenhouse effect is powerful enough to endanger the environment.
3. A causal link between human activities and dangerously high global temperatures.
4. That climate models have a high level of skill in predicting the climate.
5. A causal link between atmospheric levels of carbon dioxide and global temperatures.
6. A causal link between global warming and the gentle rise in sea level.

In response to this, Gareth claims “there is plenty of evidence to address every one of his points” and presents some attractive and interesting graphics in support. I’ll comment on what he says to each point.

1. The existence of a current unprecedented global warming trend.

GR: “…is [the current warming] unprecedented…? Well, no.” Continue Reading →