‘Loser’ turns green for exercise

Tonight’s must-see: “The Biggest Loser,” 8 to 10 p.m., NBC.

This is “green week” for NBC with lots of eco-themes. That’s hard to work into some shows – chase scenes on fuel-efficient motor scooters? – but easy for a reality show.

Tonight, the contestants try recycling. They also learn ways to exercise without electricity.

Hey, didn’t our ancestors get lots of nonelectric exercise?

Tonight’s must-see II: “The Real Housewives of Orange County” season-opener, 10 p.m., Bravo.

The bottle-blonde women here often seem interchangeable. Still, real tragedy and joy does intervene.

Tammy Knickerbocker’s daughters were stunned by the death of their father (Tammy’s ex-husband). Vicki Gunvalson’s kids are gone to college, but she keeps injecting herself into their lives. Lauri Waring is trying to squeeze a 400-person wedding into her yard.

Joining the show is Tamra Barney, 39, a bikini beauty who argues with her son, 21.

Other choices include

“Bones,” 8 p.m., Fox. An intern at the institute, the daughter of a scientist, was killed. Meanwhile, Booth pretends to be the boyfriend of Cam (Tamara Taylor) at a family dinner.

“Carpoolers,” 8:30 p.m., ABC. We meet the crazed ex-wife of Laird (Jerry O’Connell). She’s played by Rebecca Romijn, O’Connell’s real-life wife.

“House,” 9 p.m., Fox. Dr. House is supposed to diagnose a CIA agent. That’s not easy because the agency doctor (Michael Michele) won’t tell him any of the background.

“Law & Order: Special Victims Unit,” 10 p.m., NBC. Benson questions a comic-book writer whose work has been glorifying the killer.

“Nip/Tuck,” 10 p.m., FX. There are some good storylines that involve Sean and include superb actresses. He’s dating an actress (Paula Marshall); he also gets a big surprise from his ex-wife (Joely Richardson). There are also some tacky stories involving jealousy – by Sean and by two Marilyn Monroe look-alikes.

“Boston Legal,” 10:02 p.m., ABC. Alan tries a temporary-insanity plea for his client played by Mare Winningham.