I hope you will agree with me that as pioneers in aviation, we here in Bristol are also pioneers in high altitude pollutin (HAP), bearing in mind that before the jet age there was NO HAP. An apology would not go amiss – we were responsible (along with all others in the aviation industry) so we must accept it. I hope that you will agree with me also that we here in Bristol could be at the forefront of investigations into the effects of, and solutions to, HAP. Naturally, I have no objection to patting ourselves on the back, provided we face up to the problems we have gone a long way to causing. I hope you do not discard this suggestion as being from the 'loony left' or 'extreme environmentalist' – I am not. I am merely a concerned member of the public who is convinced that climate change will alter our world irreversibly over the next 50 years unless we take urgent and effective action now – although I suspect that whatever we do, it's too late.