In response to your "Thumbs Down" Star Herald editorial of Aug. 3 for those who do not believe global warming is real, the August 2006 National Liberty Journal quotes scientists who also have doubts about its relevance and/or its effect upon the earth’s climate. For example, economist and educator Thomas Sowell said, "Back in the 1970s, the hysteria was about global cooling and the prospect of a new ice age. A National Academy of Sciences report back then led Science magazine to conclude in its March 1, 1975, issue that a long ‘ice age is a real possibility.’ According to the April 28, 1975, issue of Newsweek, ‘the earth’s climate seems to be cooling down.’ A note of urgency was part of the global-cooling hysteria then as much as it is part of today’s global-warming hysteria. According to the February 1973 issue of Science Digest, ‘Once the freeze starts, it will be too late.’ "In subject matters where the evidence is inconclusive or the impact of it is yet indeterminate, it may be advisable to withhold public comment until you get all the facts together. And while you are rethinking your science, you might also want to rethink your politics. Arvin RolfsBrooklyn Center