At last Eric Alexander (Free Press, 7/3/14) seems to have grasped some of the factors involved in the science of global warming, all of which – and more – are integrated in my computer model. What a pity, therefore, that he doesn’t seem to have the means of sorting out their relative influence.

Most important of all, however, are his misguided support for the exaggerated influence of the weak greenhouse effect of carbon dioxide, and the omission of the dominant influence of naturally-variable solar irradiation. He may be forgiven the former belief by the insistent, politically-inspired and overwhelming propaganda of the IPCC (basically an internationally funded political organisation sponsored by the UK government), but he cannot be excused the latter error in view of the ready availability of the ice core data to which I have repeatedly referred, and which the IPCC chooses to ignore.

Coupled sensibly with the other factors to which he refers, this would logically lead him to the conclusion that it is not mankind's burning of fossil fuels which controls the unremitting and largely cyclical changes in our world's climate, but Nature. — Roderick Taylor, Bourne End