A thought for Earth Day

Earth day (Thursday) is coming up. Yea, every year, people celebrate the day by maybe recycling a can or two, or maybe riding a bicycle to work. This year, I have a thought for you all to ponder. Earth is a rarity in the universe. Even if there is other planets with life, and that we can live on, it seems that the odds of finding those planets or even having them are against us. So what am I trying to get at? I Think that we as the highest lifeforms on this planet have a duty, no more, a responsibility to take care of our home planet. Even if we arent emitting enough greenhouse gasses to effect the earth, why even start? I think that both sides of the whole "global warming" debate can agree on one thing: We are responsible for earth's health. So why even risk damaging earth?