The 90210 zip may still be home to the massive mansions we first caught glimpses of on "The Beverly Hillbillies," but these days The Clampetts are converting their estates to green, and not the kind you roll in. It seems the Beverly Hills City Council is borrowing a page from the eco-friendly handbook by offering incentives for homeowners to build or remodel in an energy efficient manner.

The famed city also recently passed a Green Building ordinance mandating environmentally friendly requirements for commercial and multi-family developments. We can only hope that speculator Donald Trump is mindful of these eco initiatives since lately he's been snapping up several acres of properties around the Beverly Hills Hotel.

Happily, there are many Hollywood-types we can count on to pave the way toward eco-conscious abodes. Take Johnny Depp-in 2005, the star converted his Bahamas island home to run on solar hydrogen technology. Depp's eco enlightenment may have rubbed off on his "Pirates of the Caribbean" costar Orlando Bloom. Last year Bloom built an enviro-friendly house in London. "It's as green as I can make it," Bloom said on green design website Inhabitat. "It's got solar panels on the roof, energy efficient light bulbs-newer technology basically that is environmentally friendly."

Then there are stars that take it to the max, like musician and longtime activist Jackson Browne. His Malibu ranch home is completely off the grid, and is far from running on empty. The airy barn-style house has two loft bedrooms, two guest bedrooms, skylights and tons of windows. "It's made out of masonry and rebar in a way that it stays cool all year round," Browne's live-in girlfriend Dianna Cohen told "Living with Ed," a Planet Green series starring Ed Begley, Jr.

Browne's dwelling is powered by wind turbine and solar panels; a solar-weather measuring station sits atop the property and a well provides water. "I regard this place as sort of an ongoing experiment," Browne said. "I think if you set out to do it all at once, it might seem like a huge expense, but we've done it a little bit at a time." Maybe Browne can share his expertise with Dennis Haysbert ("24," "The Unit"), who is reportedly building his own off the grid Malibu digs.

Ed Begley, Jr., Jackson Browne and Katey Sagal.

"Everybody Loves Raymond" producer Phil Rosenthal may not be off the grid but his house is eco-friendly cool, replete with recycled cork floors, denim insulation and a waterless urinal. Rosenthal and his actress wife Monica (she played Brad Garrett's wife on "Raymond") even recycled the show's set furniture-Frank and Marie's kitchen table sits in their guesthouse.