I never really cared until I started working in a plastic factory. The amount of plastic parts/granules/dust/purge that we throw into the landfill is truly disturbing. We've gotten better (MUCH better) over the past couple of years, but it still made me wake up and realize that it only takes a little effort to be less WASTEFUL.
I recycle my paper/cardboard
"If it's yellow, let it mellow...." yeah, I do that
Canvas grocery bags
Reuse plastic bags