A wide variety of environmental news, opinions, and technical information is available at Earth Portal. The site provides information that you may not readily encounter via your usual sources, along with links to selected information published by others. You can also get free access to snippets on some sites that typically charge, such as Greenwire.
The site is supported by the Environmental Information Coalition and the National Council for Science and the Environment. They say they provide science-focused content that is accurate and objective.