As the impact of humans on the Earth and on its ecological systems that sustain people become more visible--in terms of climate change, resource depletion, and species extinctions--so, too, it is becoming clearer that living sustainably is essential, not optional. To live sustainably requires a mind shift for many people. Education for sustainability is about promoting such a mind shift. Education for sustainability is about questioning the way people live, the impacts people create as a unique part of Earth's systems, and about creatively thinking of ways to live more lightly on the Earth. This article discusses the significance of starting education for sustainability in early childhood sector and the role of early childhood educators in constructing a "sustainability frame of mind" among young children.