Yes. I'd hesitate to say, as the article does, "Green religion competes with old-style religions such as Christianity, Judaism, Buddhism, and Islam".

It's possible to be "green" and also follow any of those religions. I'll freely admit that many people are just as fervent, and blindly so, in their support of "green" objectives as are any religious fundies in support of religious objectives. But if you're going to call green-ness a religion then almost anything qualifies as such.