Ok, so it feels like every other web launch these days is environmentally flavoured. It is THE big thing. So it was only a metter of time beofre someone married the wiki model to the growing green phenomenon. And here it is… Playgreen is the green wiki that encourages all visitors to improve the knowledge of how to make a difference to our planet. “Together we are building the biggest book on green living”, says the homepage. And it could well turn into that if they attract enough people willing to contribute.