General Discussion

it always helps to refer to surveys that have been done in the past. I found this by the National Geographic:

http://environment.nationalgeographic.com/environment/greendex/calculator/

Basically, they seem to have used questions that allowed them to rate individuals on an interval scale such as a 1-to-5 point rating system, or a "semantic differential" scale - a fancy name for a how-often-do-you-do-such-and-such scale. Does this perhaps settle the issue of what kind of measure we can use? Now to formulate a theory and some questions?