Is climate change real? Can it be proven? Or is it just a matter of scientific argument? The makers of the 2012 documentary "Chasing Ice" (8 p.m. and 9:30 p.m., National Geographic, TV-PG) set out to illustrate the effects of rising temperatures in the most dramatic fashion possible.
Naturalist and photographer James Balog fell in love with glaciers. They were a landscape photographer's dream, presenting dynamic beauty born of geological heft and timeless power. As he continued to document them, he was startled and alarmed to watch glaciers recede year after year at unprecedented speed. Movements, or rather retreats, that once took centuries now transpired in a year or six months.
To powerfully convey his concern, he assembled a team to place 25 time-lapse cameras in Iceland, Greenland, Alaska and Montana. The process allows viewers to watch rising temperatures melt the ice and send huge portions of the glaciers tumbling into the sea.
"Ice" also gives the National Geographic Channel a chance to return to the kind of programming that folks would like to associate with its long-revered brand. Celebrating nature and nature photographers is what National Geographic should be about, not the stupid pornographic paranoia of "Doomsday Pre ppers."
---Mezzo-soprano Stephanie Blythe sings the songs that Kate Smith made popular during World War II on the "Live From Lincoln Center" presentation of "Celebration: Stephanie Blythe Meets Kate Smith" (9 p.m., PBS, TV-G).
---Netflix continues its efforts to redefine the television experience by launching original, exclusive programming. What makes it different than HBO or Starz is that rather than "airing" a show one episode at a time, Netflix streams an entire season. In February, the service invited viewers to watch "House of Cards," starring Kevin Spacey, in its entirety. Many reviews concentrated on the novelty of the series' launch instead of the turgid nature of its script.
Starting today, Netflix makes available all 13 episodes of "Hemlock Grove," a gothic thriller based on a novel by Brian McGreevy. Look for a "Twin Peaks"-type drama set in a rundown town complete with monsters, bloody murders and the kind of violent shocks and sadistic ultra-gore that executive producer Eli Roth provided in his films "Cabin Fever," "Hostel" and "Hostel: Part II." Famke Janssen, Dougray Scott, Lili Taylor and Bill Skarsgard star.
---Ramsay helps an Italian restaurant in Long Beach, Calif., on a two-hour "Kitchen Nightmares" (8 p.m., Fox, r, TV-14).
---Violet fingers Dixon for assault on "Vegas" (9 p.m., CBS, TV-14).
---It's Nick vs. the volcano on "Grimm" (9 p.m., NBC, TV-PG).
---Nicolas Cage stars in the 1983 romantic comedy "Valley Girl" (9:40 p.m., Encore), part of the channel's weekend-long salute to movies of the 1980s.
---Leonardo continues to search for the Book of Leaves even as his efforts as a military contractor suffer a setback on "Da Vinci's Demons" (9 p.m., Starz, TV-MA).
Female welders and factory workers live communally as their men fight on the front in the war drama "Tender Comrade" (midnight, TCM), starring Ginger Rogers and Robert Ryan.
Some felt that the film's talky script, with lines such as "share and share alike, that's democracy," were nothing short of communist propaganda. Director Edward Dmytryk and screenwriter Dalton Trumbo were later called before the House Un-American Activities Committee and faced prison sentences and a Hollywood blacklist for their political affiliations.
---Lessons from a Cajun chicken chain on "Undercover Boss" (8 p.m., CBS, r, TV-PG).
---Contestants design outfits for stepping out on "Fashion Star" (8 p.m., NBC, TV-PG).
---On two helpings of "Happy Endings" (ABC): Rob Corddry guest-stars (8 p.m., TV-14); Max mans up (8:30 p.m., TV-PG).
---Grim memories resurface on "Nikita" (8 p.m., CW, TV-14).
---Military-themed bling on "Shark Tank" (9 p.m., ABC, r).
---Obstacle courses abound on "Oh Sit!" (9 p.m., CW, r, TV-14).
---Evidence points to a killer ready to strike again on "Hawaii Five-0" (10 p.m., CBS, r, TV-14).
---"Rock Center With Brian Williams" (10 p.m., NBC).
---"20/20" (10 p.m., ABC).
---John Caparulo, Heather McDonald and Mo Mandel appear on "Chelsea Lately" (11 p.m., E!, r).
---James Franco and Ed Sheeran appear on "Late Show With David Letterman" (11:35 p.m., CBS, r).
---Jay Leno welcomes Kim Kardashian, Willie Geist and Imagine Dragons on "The Tonight Show" (11:35 p.m., NBC, r).
---Rachel McAdams, Kelly Oxford and Kid Rock appear on "Jimmy Kimmel Live" (11:35 p.m., ABC, r).
---Justin Timberlake and Hayden Panettiere visit "Late Night With Jimmy Fallon" (12:35 a.m., NBC, r).
---Craig Ferguson hosts Harrison Ford and Melissa Rauch on "The Late Late Show" (12:35 a.m., CBS).
Kevin McDonough can be reached at firstname.lastname@example.org.