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HEADTOHEAD:Last week, Garry Cullenand Oisín Coughlandebated the question: Is the growth of air travel sustainable? Here is an edited selection of your comments.

For all his statistics, Garry Cullen talks in percentages and not in emissions levels. There's no mention of reduction targets. Why isn't the airline industry taking any responsibility on climate change? As OisíCoughlan points out, the 2 per cent figure the airline industry claims as its share of greenhouse gas emissions is out of date and a definite underestimation. Every industry needs to do its part to tackle climate change. Shopping trips to New York, for example, are completely decadent and wasteful. - Paul Corbett, Ireland