Maligned gases

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Your item (12 March) about trees in Edinburgh removing about 100 tons of carbon dioxide per year contained a misuse of the language.

Carbon dioxide is not a pollutant – it is a constituent of the atmosphere and whether or not any increase of it is bad or not is beside the point.

It is no more a pollutant than oxygen, nitrogen, argon or water vapour would be. This abuse of language may appeal to the global warming faithful but it is still a wilful distortion.

(Dr) PM Dryburgh

Edinburgh