In Part 2 of Ken Burns' The Dust Bowl (7 and 9 p.m., PBS/Ch. 7), things are beginning to get better.The government's attempts to stabilize the soil and bring farms back to life get a big boost when the drought ends in 1939. And California's population booms as the refugees land there.But all is not well. We also learn that, if we're not careful, the Dust Bowl could return.It's fascinating stuff.Elsewhere on TV ...The TeenNick 2012 HALO Awards (6 p.m., Nickelodeon): Four ordinary teens are honored for doing extraordinary things. Justin Bieber, Josh Duhamel and Emma Stone are among the celebrities who appear.NFL (6:30 p.m., ESPN): Chicago Bears at San Francisco 49ersHow I Met Your Mother (7 p.m., CBS/Ch. 2): Robin negotiates Barney's return to the strip club.Dancing with the Stars: All-Stars (7 p.m., ABC/Ch. 4): The remaining contestants perform.The Voice (7 p.m., NBC/Ch. 5): The top 10 perform.The Dust Bowl (7 and 9 p.m., PBS/Ch. 7): The conclusion of this excellent two-part, four-hour documentary.Bones (7 p.m., Fox/Ch. 13): The remains of a crime-scene cleaner wash up on a beach.90210 (7 p.m., CW/Ch. 30): Navid puts Liam and Lindsey's sex tape on display.NBA (7 p.m., ROOT): Houston Rockets at Utah JazzThe Layover with Anthony Bourdain (7 and 10 p.m., Travel): Tony travels to Chicago.Partners (7:30 p.m., CBS/Ch. 2): Joe doesn't like Ali's friends and Ali doesn't get along with Louis' friends.2 Broke Girls (8 p.m., CBS/Ch. 2): Caroline and Max ask two Amish boys to build a barn for Chestnut.Gossip Girl (8 p.m., CW/Ch. 30): Ivy helps Chuck find incriminating evidence against his father.Mike & Molly (8:30 p.m., CBS/Ch. 2): Mike gets sick on Thanksgiving.Hawaii Five-0 (9 p.m., CBS/Ch. 2): A computer hacker is murdered.Castle (9 p.m., ABC/Ch. 4): Castle and Beckett are forced to flee with a witness in tow.The Secret Life of the American Teenager (9 p.m., ABC Family): Grace stays by Jack's side at the hospital.Revolution (9 p.m., NBC/Ch. 5): Miles and his followers close in on Monroe.