Many organisations have estimated the economic costs of energy waste from light pollution; a quick Google search will turn up countless figures and calculators. It’s easy to overlook lights that may be set to wrong timers, have no health and safety purpose or have simply been forgotten; this is what the Snap it Off scheme addresses. So this Earth Hour, think about your year-round energy habits, and don’t forget to get out there and get snapping!

You can sign up to participate in Earth Hour here