One hundred years ago, the first battles of World War I were being fought in Belgium. When the war started, everyone thought it would be over by Christmas and nobody was worrying much about food and supplies, but it turned into four long years that changed the world. In the Guardian, Sarah Lonsdale notes that as the war dragged on, supplies on the home front ran short and people of all economic strata became part of a "save and repair" culture.
As the war dragged on, there was a major propaganda campaign to encourage people to conserve. This poster has been all over the internet for years, because the instructions are as relevant today as they were then. It's been on TreeHugger as part of our earlier looks at posters from both World Wars, but this slideshow will only show those from World War I.