Encourage everyone to recycle. A site that will change the world. I need help designing this page. Any help from the community would be a great service to the larger community. An anti-poaching group.
Fundraisers are pretty good.
A network of information, example, practical help. As a collective conciousness, the possibilties are endless. But a recognizable sense of caring about the environment would be a start. An Awarness Group to help spread the word about how importain the Earth is and what will happen if it is destroyed. What I would like to see is a full fledged cyber community center.