Fans claim The Simpsons predicted Greta Thunberg's UN speech

Fans of The Simpsons are claiming the show predicted Greta Thunberg's climate change speech at the United Nations, calling her a real-life Lisa Simpson. 

Following Thunberg's impassioned plea to world leaders, social media was flooded with comparisons to eight-year-old Lisa, a character who has frequently campaigned about social issues during the show's 30-year run. 

During a 2009 episode called 'The Good, the Sad and the Drugly', Lisa tells her classmates their town of Springfield won't exist in 2050 due to climate change. 

"With global warming trapping the CO2 inside our poisonous atmosphere, our superheated oceans will rise, drowning our lowlands, leaving what's left of humanity baking in deserts that once fed the world," she exclaims. 

Social media commentators pointed out the speech is eerily familiar to the message Thunberg pushed a decade later. 

"People are suffering. People are dying. Entire ecosystems are collapsing," she said at the Climate Action Summit on Monday. 

"We are in the beginning of a mass extinction, and all you can talk about is money and fairy tales of eternal economic growth. How dare you!" 

"Greta Thunberg exudes big Lisa Simpson energy," one Tweet read. 

"Greta Thunberg reminds me of Lisa Simpson and I think we should listen to her," said another. 

It's not the first time fans have claimed the show can predict the future. In an episode from 2000, Lisa appears as president, telling advisors: "As you know, we've inherited quite a budget crunch from President Trump." 

Viewers have previously claimed the show foreshadowed other world events such as the Ebola virus outbreak and Canada's legalisation of marijuana.