earth day

Today was the Earth Day celebration at Lawrence University. I took part in celebrating by consuming less, conserving more, being aware of carbon footprints and playing in various musical ensembles throughout the day. All this began to make me wonder... 

Why don't religions take an active role in helping the environment?

Then, that got me thinking of possible religions that DO worship/help the environment, and the only thing that I could think of was Wicca or witchcraft. I know that followers take special care and worship of the environment, treating everything in nature as sacred and treating nature almost as gods. Why isn't Wicca  more popular now that Global Warming is such a threat? Why is it frowned upon? I'm not saying that I'd take part in a witchcraft cult or worship, but if it helps the environment I might think about it. 

Could we maybe discuss some of this in class? I'd like to learn more about different religions such as this.