For many years the white line trails left behind by a plane in the air has been seen as a harmless trail.

Some say it’s a harmless trail of condensation left behind.

However a number of experts are now stating that it could be having a chemical impact on global warming.

An amazing picture was taken by a pilot that was passing another plane in the air and shows just how much of a trail can be left by a Boeing.

We’d be keen to get your thoughts on the matter discussed.