See? You Do Make a Difference
Every time I fly I notice that just before we land, the attendant acknowledges over the loudspeaker that they know I had many choices when booking my flight, and they are glad I gave them my business. I like that.
Every product we buy is an endorsement, and companies know it. Check out the story in today's Christian Science Monitor, which gives examples of how consumers have demanded more environmentally-sound products -- and got them.
EWG can help you make healthier, more environmentally friendly decisions when shopping: check out https://www.ewg.org/shopping/, and as your Grandma says, Use/Eat/Wear it in good health.