These stamps feature images of birds and snow clouds that turn into skeletons and thunderstorms when heated to send a message about the consequences of climate change. Commissioned by the Finnish Post, the Climate Change Stamps aim to offer an innovative way of communicating the negative effects that rising temperatures will have on Finland. Printed in colour-transforming ink that reacts to heat, these symbols change from black to clear when warmed up by being rubbed with a finger, revealing additional designs underneath. The snow cloud transforms into a thunderstorm to represent the loss of winter snowfall, while the depiction of immigration turns to mass migration as climate refugees are forced to leave their homes and relocate. The bird is also made to turn into a skeleton, as a representation of the extinction of many of Finland's native species. These hidden images reveal what the future will look like "if we don't act fast to fight climate change"