GreenAds, a "values-based online ad network," launched in beta last week in hopes of attracting media spending from advertisers interested in reaching an audience interested in social and environmental issues - a potential reach of some two million monthly unique visits, according to the company - ClickZ reports. The network includes websites in five categories: sustainability and environment; health and wellness; spirituality and personal development; and social responsibility and fair trade. The company has also launched a B2B channel for green business products.

Publishers include Grist Magazine, DrWeil.com, E/The Environmental Magazine.com, and blogs TreeHugger and MetaEfficient. Text ads and a range of banners are among the formats available, along with an email blast option. Advertisers can place orders on either a CPM or CPC basis.

GreenAds' first advertiser is "Ode" magazine, and there is apparently some interest from retail, automotive and telecommunications companies. GreenAds' official launch is slated for October 1.