SIR - Keith Thomson (T&A, November 2) says I ask a lot of questions. Surely this is an admirable fault and it is a great pity I do not get simple answers.

He is wrong about Jonathon Porritt and obviously did not hear the same comments made by him on Radio 4, as I did.

He was advocating two-child families as a desirable solution in respect of human emissions of CO2, upon which both KT and I are agreed.

I take his point about the use of oil for plastic bags but this does not answer the economic problem that will be faced by those who make them.

It seems indisputable to me that simple items such as bags can be made from things other than paper or cloth - which are not oil-based - and that a substitute for oil as we know it today will be conceived.

Lastly, I get fed up about people saying man is destroying the planet. Did whatever kill off the dinosaurs destroy the earth? No! Man will destroy himself, not the planet and perhaps this is what God - whatever he is called - ordained.

Philip Bird, Nab Wood Terrace, Shipley