The Design: Echoes of the Earth Flag, the Ecology Flag, and the Rainbow Flag with elements that are easy to reproduce and make.
The Colors: Yellow, White, Blue &amp; Green bands could symbolize the sun, the ozone, the waters, the earth, or solar power, wind power, tidal power, and green technologies. Or perhaps they mean something else to you?

The Circle: Inspired by the Big Blue Marble, the first image humanity had ever seen of the Earth from space and the power of coming together for the common good. Unification.
I created the file, from a design in the public domain
http://www.climateflag.org/