Joe Gill’s article on Irish grass (Irish Examiner, Aug 15) has much to commend it, but it does not reflect a good grasp of the science of climate change.

Further to your recent correspondence I would like to inform you that immediate suspension of fluoridation of public drinking water supplies is indicated on the grounds that: it is unnecessary (fluoride is available in mouthwashes, toothpaste, etc for those who desire it); its efficacy is in doubt; it is dangerous to human health, particularly to infants; it is damaging to the environment; it is probably illegal – medicating a population with a substance which has not undergone testing as a medicine; it is a waste of public funds in economically stringent times.