On the 24th October, people in 181 countries came together for the most widespread day of environmental action in the planet's history. At over 5200 events around the world, people gathered to call for action on the climate crisis. The 350 campaign refers to the number, in parts per million, scientists have identified as the safe level for carbon dioxide in our atmosphere. Sheffield Friends of the Earth joined forces with other local environmental groups to create the following picture to raise awareness locally.