[palmer]

Thanks for the appeals to authority. Did the NAS or the AGU make a statement specifically about the urban heat island effect? I thought you were discussing urban heat island effect, but now you seem to have switched to global warming.

[elvisabel78]

All my statements about urban heat islands have been intended to counter the assertion by one member that "land temperature records are caused by urban heat islands". And he meant GLOBAL temperatures. Not local.
Now if he was in fact talking about local temperatures, I don't know why he did it, because he was apparently responding to a message i posted about GLOBAL land-based temperatures.

And my last post simply said that in regions where urban heat islands are most present, the trend in the surface temperature is not different to the trend of the lower tropospheric temperature.

[elvisabel78]

The NAS' did not itself make any statement about urban heat islands, that i know of. The President asked them to find any weaknesses in the IPCC report. Unfortunately for him, NAS did not cite IPCC's assertion about heat islands as a waekness. All NAS has said about the IPCC is that it supports it:

The reason for this is obvious: The president of NAS, Bruce Albert has had high praises for the ICPP report. In 2001 He signed, alogn with members of 8 countries including the US and the UK, India, etc., a joint statement :

1)We recognise the international scientific consensus of the Intergovernmental Panel on Climate Change (IPCC)
link

It was also said in this statement that It is vital that all nations identify cost-effective steps that they can take now, to contribute to substantial and long-term reduction in net global greenhouse gas emissions.

The AGU has not even attempted to link urban heat islands to land temperature records.