Charging frequent fliers more would be a “fair way” to tackle the impact of aviation on the planet, an environmentalist has argued. The Government is pressing ahead with its promise to lift the passenger cap at Dublin Airport, which limits the number of passengers to 32 million every year. AdvertisementOn Lunchtime Live, environmentalist Duncan Stewart said increasing the passenger cap was at odds with the country’s commitment to tackle climate change. However, Mr Stewart is sceptical and argued that increasing taxes on frequent fliers would be a “fair way” to cut emissions. “It’s the only way in and the only way out.”Main image: Passengers wait to board a 'redeye' early morning flight at Dublin Airport.