As people living on the Earth, we have a responsibility to respect and care for it. For me, that does not mean being perfect. It means doing what we can. If you recycle most of the time, bring your own bags to the grocery store, and in general try your hardest to be respectful of the environment and make conscious choices as a consumers, it makes more of an impact than you realize.
One thing that you can do every day is visit the Care2 website and make your daily clicks. There are also great articles and action steps for things that you can do to help the environment. I'm convinced that it is nearly impossible to do everything and be perfect. But if we try, that is what is truly important.