The bombing campaigns of World War Two left an indelible mark on the world’s towns and cities and in the memories of the people who survived them. In a new study, we found that the most destructive war in history also made its mark in our atmosphere. In an age when long-term monitoring of the environment is increasingly important, scientists are turning to historical datasets for clues in solving present-day science puzzles. One such dataset is the unique record of the Earth’s ionosphere – the electrified region of the Earth’s upper atmosphere, which was painstakingly recorded from 1933 onwards at…

This story continues at The Next Web