Global warming: different views

Last month the Brookings Institution issued a paper on factors influencing Americans' perceptions of global warming. Major surveys were taken in Michigan and Pennsylvania. The five factors presented to respondents as affecting their belief in global warming:

* Declining glaciers and polar ice
* Higher temperatures in local area
* Computer modeling
* Hurricane Katrina
* "An Inconvenient Truth"

The authors found the first two factors to be significant in Americans' belief in global warming; the last two less so....