Sea change

A new episode of "Nature" explores "The Sagebrush Sea," an area of North America with its ecosystem of wildlife in jeopardy due to an ever-changing environment. 7 p.m. TPT, Ch. 2

Q&A

In the new game show "500 Questions," host Richard Quest drills contestants with a rapid fire of trivia. Get three in a row wrong, and you're out of there. 7 p.m. KSTP, Ch. 5

Sweet home Chicago

Last week, David Letterman and Bill Clinton gushed over Buddy Guy, which I'm sure the blues legend was happy about, but I'm guessing he's even more thrilled to go drinking with Jay and Sean on a new episode of "Best Bars in America." 8 p.m. Esquire Network

Neal Justin