"Sun Tea" is the sixth episode of the fourth season of the American television comedy series 30 Rock. It was written by show co-producers Dylan Morgan and Josh Siegal, and directed by Gail Mancuso. It originally aired on NBC in the United States on November 19, 2009. Guest stars in this episode include Nate Corddry, Al Gore, Marceline Hugot, Chris Parnell, Bobb'e J. Thompson, and Tony Torn.

In the episode, Jack Donaghy (Alec Baldwin) puts NBC page Kenneth Parcell (Jack McBrayer) in charge of reducing the fictional sketch comedy show The Girlie Show with Tracy Jordan's (TGS) carbon footprint. Meanwhile, Liz Lemon (Tina Fey) learns her apartment is becoming a condominium and tries to kick out the resident above her (Corddry). At the same time, Jack and Tracy Jordan (Tracy Morgan) reevaluate fatherhood.

"Sun Tea" received generally mixed reviews from television critics. According to the Nielsen ratings system, the episode was watched by 5.858 million households during its original broadcast, and received a 2.9 rating/7 share among viewers in the 18–49 demographic.

Liz Lemon (Tina Fey) learns that her apartment building is being converted into a condominium and is told that she must purchase her apartment or face a rent increase. She decides that she wants to buy her apartment and the one above her, and turn them into her dream home. When she learns that her neighbor, Brian (Nate Corddry), will not be bribed out of his apartment, she agrees to move in with him, seemingly to save money, hoping to drive him out with her behavior. At work, Liz is disgusted by her staff writer, Frank Rossitano (Judah Friedlander) peeing in bottles to stop global warming. However, she decides to adopt this behavior to force Brian to leave; she is successful.

At the same time, Tracy Jordan (Tracy Morgan) tells his boss, Jack Donaghy (Alec Baldwin), the negative impact fatherhood has had on his life. They both decide to get vasectomies from Dr. Leo Spaceman (Chris Parnell). While waiting, Jack discovers the respect Tracy's son, Tracy Jr. (Bobb'e J. Thompson), has for his father. After being put under, Tracy realizes his life is horrible because he does not have a daughter. Luckily, Jack is able to stop Dr. Spaceman before he conducts the procedure.

Meanwhile, NBC page Kenneth Parcell (Jack McBrayer) is put in charge of reducing TGS with Tracy Jordan's carbon footprint. He argues that Frank's habits, albeit disgusting, are actually environmentally friendly. Kenneth gets advice from former Vice President of the United States Al Gore, who tells him to recycle everything "including jokes". At that point, Gore declares that a whale is in trouble and runs off.

"Sun Tea" was written by show co-producers Dylan Morgan and Josh Siegal, and directed by Gail Mancuso. This episode was the first writing credit for both Morgan and Siegal, and Mancuso's eighth directed 30 Rock episode. Morgan and Siegal, along with series producer Paula Pell, would later collaborate on the episode "Argus", that aired in the show's fourth season on April 29, 2010. "Sun Tea" originally aired on November 19, 2009, on NBC in the United States as the sixth episode of the show's fourth season.

This episode aired as part of Green Week, an initiative introduced by NBC's Chief Executive Jeff Zucker which included having every primetime program which aired between November 15 and November 22, 2009, contain some sort of positive environmental theme. Jack McBrayer, who plays NBC page Kenneth Parcell, in regards to the environmental theme, said "It's something that is relatable and is something that a lot of people are doing. Everybody is on board with greening up the place and being more environmentally friendly in real life. Every now and then people need to be reminded of things that can be done." "Sun Tea" was filmed on October 23 and November 10, 2009.