Commercial planes flying regularly above or below the typical altitude of 31,000 to 42,000 feet could cut emissions significantly. Getty Images
Commercial planes flying regularly above or below the typical altitude of 31,000 to 42,000 feet could cut emissions significantly. Getty Images
Higher or lower: Flying at different altitude 'could help aviation cut climate impact'
Eliminating contrails could help the sector reduce its carbon footprint by 40 per cent, experts say
