My first concern was to ensure it was attractive! But yes, I chose the colors intentionally. Green is sort of obvious, I should think. The white cuts through the edge of the green to suggest that we don't really live in a closed system; after all, terawatts of sun energy beam down on us every day. I wanted to stay away from true primary colors because the issues of sustainability are more complex than can be solved with simple approaches. Primary colors suggest simplistic, unconsidered development (to me). Finally, the deep blue symbolizes the natural resource cycles of the earth: water, air, dirt/minerals. Orange, or the color of the harvest, is for the things we grow and use: plants and animals. Purple (one of the first manufactured dye colors) symbolizes human industry and endeavors.