I'm not going to sit here telling everyone to revamp their houses, sift through every piece of trash for recycling, planting more trees, installing water conserving shower heads, etc... Who has the money, the patience or the time for that? Not very many people.
I just think we should all pick 1-2 things that would make us more environmentally friendly to help preserve mother Earth, and chose to focus on doing those few things. If each person did a few little changes, there would be some major beneficial changes that would come from the combined efforts of everyone.
It's not so much about are we hurting the Earth by our current actions, but should really be about NOT wanting to hurt our Earth; taking measures to prevent damage of any kind.