[Natural Innnovations]: Thank you, Mitra, for flagging this article by George Monbiot, which tracks in detail the mistakes behind David Bellamy’s climate change denial (published in New Scientist).
Not to put too fine a point on it, Monbiot concludes:

It is hard to convey just how selective you have to be to dismiss the evidence for climate change. You must climb over a mountain of evidence to pick up a crumb: a crumb which then disintegrates in your palm. You must ignore an entire canon of science, the statements of the world‰s most eminent scientific institutions, and thousands of papers published in the foremost scientific journals. You must, if you are David Bellamy, embrace instead the claims of an eccentric former architect, which are based on what appears to be a non-existent data set. And you must do all this while calling yourself a scientist.

Monbiot’s irked that New Scientist, which published Bellamy’s letter, Glaciers are Cool in April, hasn’t asked Bellamy for a correction. They have, however, offered refuting letters — like this one:

If New Scientist hasn’t already done so, global warming sceptics’ points, such as David Bellamy’s, are well rebutted at, a new blog set up by climate scientists.
Repeated reference to that site could save many trees being transmuted into copy in the magazine, thus shrinking its footprint. This would help the majority of readers who are doubtless aspiring to lower their carbon emissions.

and offered Meeting the climate change sceptics back in Feburary 2004.