Graham P Davis wrote in
:

A Globescan poll of 30 countries gave 90% agreeing that global
warming was a serious threat. In the USA this dropped to 76% with
21% saying it was not serious.
(http://www.ethicalcorp.com/content.a...4&ContTypeID=5
2)

I haven't found a poll or the UK as a whole although I think one a
few months ago was in agreement with the Globescan poll.
snip

It might have been this poll, published in April:

http://www.globescan.com/news_archiv...atechange.html

That gave the figures for Great Britain and the USA (equivalent 2003
figures in brackets) as:

Very serious: GBR 70% (50%); USA 49% (31%)
Somewhat serious: GBR 21% (35%); USA 27% (40%)
Not very serious: GBR 6% (9%); USA 12% (13%)
Not at all serious: GBR 2% (3%); USA 9% (11%)

The USA's 49% "very serious" figure was the lowest of all developed
"first world" countries.

--
Bewdley, Worcs. ~90m asl.