The continuing campaign by teenage climate activist Greta Thunberg to get everyone to reduce their carbon emissions has prompted some soul-searching over when, and whether, it is OK to fly.

In Scandinavia there is even a word for it - "flygskam" - flight shame.

If you don't want to add to the carbon in the atmosphere, you could, like Greta, take the train instead.

But if you are have already booked your fight, or if flying is the only way of getting to your destination, you can instead donate to a carbon offsetting scheme.

These allow individuals and businesses to give money to environmental projects around the world in order to balance out their carbon footprints. But how do you choose a scheme that has meaningful impact? Click here to read the BBC report.

For more information on Green Motion's carbon offset initiative which will allow you to rent your next car with a clearer conscience, visit greenmotion.com/green-heart-donation