"Every month people who work in the environmental field meet up for a beer at informal sessions known as Green Drinks. We have a lively mixture of people from NGOs, academia, government and business. Come along and you'll be made welcome."
An international phenomenon, you should be able to find a relatively local chapter. My co-workers and I enjoyed September's Green Drinks in the City of Sonoma (granted, we were the youngest patrons there, but I don't think that's always the case).
