Carbon dioxide

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I am grateful to Dr Gavin 
Whittaker (Letters, 14 March) for introducing me to the latest amendment as to the meaning of pollutant.

If the effects of CO2-induced global warming are ever established, this variation of the definition may be justified but, until that happens, I will defend the established meaning of the word.

(Dr) PM Dryburgh

Newbattle Terrace

Edinburgh