Delingpole was educated at Malvern College and Christ Church, Oxford.

Delingpole regularly expresses the view that man-made climate change is not as extensive as described, and has linked mainstream scientific projections with "the atavistic impulse which leads generation after generation to believe it is the chosen one: the generation so special that it and it alone will be the one privileged to experience the end of the world; and the generation so egotistical that it imagines itself largely responsible for that imminent destruction". He has also objected to what he sees as the attempted smearing of climate-change sceptics by their opponents, which he says is part of a strategy to exaggerate or otherwise manipulate data to bolster the case for anthropogenic climate change.