Travelling by plane has never been more popular, with four billion passengers flying every year.

But aviation emissions contribute to climate change, and scientists say we need to do more to tackle the problem.

BBC research has found that only a tiny fraction of passengers travelling with the world's biggest airlines are choosing to offset their carbon footprints.

Carbon offset schemes involve paying extra in order to contribute to environmental projects that reduce the amount of CO2 in the atmosphere, though some say it's just an excuse to continue polluting.

But it's not the only way to reduce the impact of your flight on the planet. Click here to watch the BBC video.

For more information on Green Motion's carbon offset Great Heart initiative to do your bit for the planet on your next trip, visit www.greenmotion.com/green-heart-donation