A phrase coined by corporate cocksuckers to create a market for "environmentally friendly" products, when of course they are nothing of the sort. Pop those two words into an advertisement and you have gullable morons buying your product by the droves.
GREENHOUSE GAS ALERT! Try our good wholesome whole wheat bread rich with amino acids, probiotic cultures, and more bullshit phrases that have been cleverly implimented into your lives in order to get us rich! BUY OUR BREAD YOUR CHILDREN'S SAFETY DEPENDS ON IT! GREENHOUSE GASSES !
Everytime you buy a product that mentions greenhouse gases, Jesus crys.