Suzanne Maher isn't correct when she says they're a new phenomenon: you can see condensation trails left behind aircraft in images from the Battle of Britain during the Second World War.

The Battle of Britain was one of the most pivotal moments in the country's history. It marked a turning point when Britain stood alone against Hitler's seemingly unstoppable military power.

Suzanne Maher isn't correct when she says they're a new phenomenon: you can see condensation trails left behind aircraft in images from the Battle of Britain during the Second World War.