We are an informal monthly gathering of Green, Environmental and Energy Efficiency professionals, educators, public servants, activists, and locals wanting to learn more about going green. If you are new, just go up to someone and say "are you green?", and you'll be made welcome. The spirit of Green Drinks is that anyone can come which makes for interesting interactions.
There are lots of benefits to green drinks; they are hard to quantify, but when you have seen people come and make new links and learn and argue and set up new schemes and get new jobs etc, it is a good feeling.