It's Earth Day so it seems appropriate to bring out the two conservation-themed stamps from the box. This stamp has a great look and bold colors (although mine is a little on the weathered side) and seems inspired by the conservation and alternative energy efforts stemming from the oil crisis earlier in the '70s.
And this one is from a set of four conservation stamps (Soil, Air, Water, Energy). I don't think soil conservation has really hit the mainstream consciousness here, so props to the Australians.
Even though it's decades later, we're still facing the same challenges, if not worse. The USPS has just introduced a new sheet of Go Green stamps. Let's hope these ideas take!