Let's set a few things straight. The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s. But the gravy train was too big, with too many jobs, industries, trading profits, political careers, and the possibility of world government and total control riding on the outcome. So rather than admit they were wrong, the governments, and their tame climate scientists, now outrageously maintain the fiction that carbon dioxide is a dangerous pollutant.

Wesley J. Smith, firstthings.com
A former GWH believer named David Evans changed his mind some years ago and now says that the human responsibility for global warming is minimal, and that the warming industry is steeped in ideology after the expected scientific findings didn't work out. He once advised the Australian Government on the issue, helping to build its carbon measuring system, so I think the change in views is noteworthy. But it is also worth noting that since turning skeptic, he's been attacked roundly and bitterly by the warming establishment and in left wing politicized sites, such as "Source Watch," so you will have to judge his credibility for yourselves.
From his column, "Climate Models Go Cold:"

Let's set a few things straight. The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s. But the gravy train was too big, with too many jobs, industries, trading profits, political careers, and the possibility of world government and total control riding on the outcome. So rather than admit they were wrong, the governments, and their tame climate scientists, now outrageously maintain the fiction that carbon dioxide is a dangerous pollutant.

Rest of the article.