The Fish Symbol and an Idea

[OnionPatch]

We see the fish symbol everywhere out here in Onion Patch. It's on cars and on ads in the yellow pages. Businesses put these symbols on their ads and their shop doors to let people know they are Christians, correct? And I always assumed they mean "Right-wing, fundie-type Christians. So, I don't do business with these people. (Note: I am a Christian but firmly opposed to the right-wing fundie Christian agenda. I feel they have hijacked Christianity.)
I've always agreed with the idea that we can vote with our wallets as well as at the ballot box and I try to keep up on which companies I don't want to do business with, etc. But it is really hard to keep track of everything. I can't get on the internet to look up the company of every gadget I buy. It would take up every minute of my spare time to research every company I do business with. So I wonder why WE don't have some sort of symbol? It would be something like the Good HouseKeeping symbol. It could be applied generally to many products, services and/or businesses. It would mean that the business or product has been produced without slave labor, harmful environmental practices, or made from companies who are strongly anti-labor, etc. etc. A non-profit group would monitor the businesses. It would be a voluntary thing....companies could apply to get the stamp because it would be a great advertisement. I would buy the product over stampless ones, wouldn't you?
Has this idea been tossed around already? Is it impractical? Do you think there are too few businesses out there that could even earn a rating? (It wouldn't have to be perfect...just fairly neutral.)
What do you think. Am I dreaming that such a thing could be possible or work?