"BLUE integrates all four streams of sustainability: social, cultural, economic and environmental. BLUE puts the way we treat ourselves and each other at the center of our focus"
where as "green" usually focuses on just the environment.
Adam Werbach recently made a great speech about this. i put the link under my sustianability links as BLUE is better than green.
it is really long, but i think it will be worth your time.
byeness