Climate activist Greta Thunberg appeared in an Oscar clip showcasing the power of documentary films.
This was followed by actor Mark Ruffalo announcing the winners in the documentary categories at this year's Oscars ceremony on Sunday night.
The Michelle and Barack Obama produced American Factory was awarded the best documentary feature.
The film, about a culture clash at a Dayton, Ohio manufacturing plant, was the first project produced by the duo's new production outfit and marks a running start for the company.
The film hails from filmmakers Julia Reichert and Steven Bognar.
It was released through Netflix as part of a lucrative deal Higher Ground has with the streaming service.
"Working people have it harder and harder these days, and we believe that things will get better when workers of the world unite," Reichert said in her acceptance speech.
"Congrats to Julia and Steven, the filmmakers behind American Factory, for telling such a complex, moving story about the very human consequences of wrenching economic change. Glad to see two talented and downright good people take home the Oscar for Higher Ground's first release," Obama wrote in a tweet.
The film had been competing against The Cave, The Edge of Democracy, For Same and Honeyland in its category.
The documentary is set in an abandoned General Motors plant in Ohio that reopens when Chinese billionaire chairman Cao Dewang buys it and turns it into windshield factory Fuyao Glass America.
Leaning to Skateboard in a Warzone (If You're a Girl), on the other hand, won the Oscar for documentary short subject.
In the same category, Indian-American filmmakers Smriti Mundhra and Sami Khan's St. Louis Superman was competing.
Greta is known for her work on Climate Change: The Facts, Answers to Questions You Didn't Know to Ask About Climate Change and Greta.
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