Last year I was collecting for the local stroke foundation, giving away stickers for each donation.
I ran out of stickers and attracted the most donations for a single collector.
By "selling" good feelings.
Like a street seller, I was calling for people to donate and in return feel good for the whole day!
Companies that understand how to tap into these "good feelings", can do well financially by selling more product/ service and charging more for their product/ service.
For instance, if I was given the choice of 2 chocolate bars and 1 was 10% dearer however, it stated that it supported fair trade, I would buy that brand every time.
So you can save the world profitably and ethically!