an image from the US government EPA "Sunwise" program. I converted it from PDF format, and removed all the "sunwise" logos. the source link is here - http://www.epa.gov/sunwise/doc/mission_story.pdf
Here’s an exhibit shelf to place your products on! Feel free to use it in commercial and non-commercial projects, personal websites and printed work, as long as it’s a part of a larger design.