What I do or don't do doesn't have much if any impact, its the manufacturing corporations who are polluting everything.
Nonetheless, I try to do my part in helping nature along in my small plot of land in suburbia by providing birdfeeders and water year around, having a part of my backyard go unmowed and growing wildflowers for butterflies and bees, planting only things that can take the hot, dry and humid tennessee summers without watering, I use a rainbarrel, I have a corner of the yard for table scraps and tree branches. I have a 3x3 raised bed garden where I use the "French Intensive Method" of gardening. Next year I'll add another. I teach my kids the value of a catapillar, and that not all bees are "out to get you", how everything is connected in our world.