I prefer the side-by-side look of entry #39 rather than the stacked version (#38). I think the graphic is simple yet conveys the message which is great. I really like #36 and #37...because they aren't as literal as the other 2 I think you're eye is drawn to them more and you want to look at them longer to take in the design. The dots kind of resemble a sunburst or a wind turbine (not sure if that was the intent or not). I think I'd prefer to have the colors be a little more blue and green rather than the more teal color. Overall, good job. Thanks!
I've adjusted the green. The symbol is meant to be evocative of the green/eco movement in a non-specific way, bringing to mind things like growth, optimism, energy, perhaps emanating from a source, heat maybe...and bright ideas too.