The word "cake" appeared 10 times more on British television than "climate change" in 2020 while "dog" was mentioned 22 times more, according to new analysis.
This drop can be explained by competition for air time from global events, the Subtitles to Save The World study said, with "lockdown" and "COVID" entering the public discourse, and reruns and archive programmes replacing new TV shows.
"However, the COVID story is of course a climate story," said Albert director Carys Taylor.
"It's a story about our relationship with the natural world, and also the story of how quickly we can adapt, innovate and improve," she added.
The study analysed almost 400,000 hours of TV programmes - excluding the news - from the BBC, ITV, Channel
4, Channel 5, Sky and UKTV.
As society talked about a "green recovery" from the pandemic, mentions of individual action such as "recycling", "reusing" and "veganism" all increased in 2020.
But there were fewer words associated with the "systemic change needed to reach net zero" such as "renewables".
Meanwhile, "beer garden" and "banana bread" cropped up far more than wind or solar.
The screen industry organisation believes the UK's "world-leading" broadcast sector has "extraordinary power" to shape culture, provide "a stage for inspiring stories" and encourage audiences to "contribute to important public conversations".
It says the biggest such conversation of our time is how we tackle climate change.
"The scale of the challenge to achieve our net zero targets in time, fairly and effectively, is daunting but the creative opportunity for broadcasters to support the transition is immense," said Ms Taylor.
A previous Albert study found that each hour of television produced leaves an average carbon footprint of 9.2 tonnes, which is the equivalent of two households' annual consumption.
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Story By Sky News