According to Treehugger.com, Cameron Diaz and Brook Shields have an environmentalist side.

Cameron recently made a documentary called "Power Shift" with the goal of educating people on alternative energy sources.  Her movie is in circulation with The Earth Cinemal Circle.  For $18 bucks, you get an eco movie every other month.

Brook Shields talks about making changes in her own routines, including buying recycled goods and using green cleaning products. 

She admittedly hasn't gone "all the way" green, but knows that the little adjustments make a difference.  I like this approach to eco-friendly behavior, in that setting reachable green goals keeps me motivated.  I'm not quite running on solar energy, but I think that one step at a time really works in the long run.