Watch out, Greta Thunberg, there's a new teenage activist on the block.

Naomi Seibt, or the "anti-Greta Thunberg" as she has become best known as, is the latest protester to make headlines, but for slightly different reasons to her Swedish counterpart...

Greta Thunberg has become the face of the climate change movement.

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Thanks to her relentlessly passionate activism, the seventeen-year-old Swedish environmentalist has skyrocketed to international fame.

But where did it all begin?

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Starting one day in August 2018, a then fifteen-year-old Thunberg decided to skip school to sit outside Sweden's Parliament in Stockholm with the simple sign, “Skolstrejk För Klimatet" - translating to “School Strike for Climate."

For 3 weeks, the teenager would sit in silent protest outside of Parliament alone...

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And vowed to not stop until her government had done something about the climate change crisis. And it didn't take long for her message to catch on.

Photos of the teen sitting in protest went viral on social media...

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And, suddenly, millions of people were inspired.

Within a year, her message had spread like wildfire...

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And millions of people all over the world had taken to the streets to fight against climate change.

It was a whirlwind year for the teenager.

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Thunberg attended numerous marches and protests all over the world and was even invited to the UN Climate Conference in New York, which she traveled to on a zero-emissions boat.

Her damning speech went viral...

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The activist blasted world leaders and politicians for their lack of action regarding climate change. "How dare you," she exclaimed. "I shouldn't be up here. I should be back in school on the other side of the ocean, yet you all come to us young people for hope. How dare you?"

And, fast forward to 2020...

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Greta Thunberg has become somewhat of a household name.

She was nominated for the Nobel Peace Prize last year...

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And was declared as TIME's Person of the Year for 2019.

She has risen to unprecedented levels of fame...

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And her unwavering commitment to saving our planet continues to inspire people to live more sustainably every day.

However, despite her millions of followers and supporters...

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There are a handful of people who aren't too convinced by her message, including another teenage activist who spreads a different message entirely.

Meet Naomi Seibt.

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The German, climate change denier version of Greta Thunberg.

Following Thunberg's viral success, Seibt has been inspired to fight for what she believes in...

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Which is that climate change is not real.

The nineteen-year-old regularly preaches about "climate alarmism"...

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An expression that is used by global warming skeptics to describe scientists and commentators who stress the catastrophic effects of global warming and climate change.

And she wants to spread her message to the world, just as Thunberg has done with hers.

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"I have good news for you. The world is not ending because of climate change," Seibt declared in a YouTube video for the right-wing publication, Heartland Institute. "People are being force-fed a very dystopian agenda of climate alarmism that tells us that we as humans are destroying the planet and that we, the young people especially, have no future."

She believes that there is a "lot of fear-mongering going on"...

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And claims that she has done her own research into the matter. "I do not believe that the climate is changing because of manmade CO2 emissions. And if it was, I don't believe that would have such a detrimental effect," Seibt told Insider.

And now, she has come after Thunberg.

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Seibt recently targeted the Swedish activist for "not knowing any more than a random teenager" after she was included on a panel of "experts" to discuss the world's handling of the coronavirus pandemic back in May.

Seibt slammed CNN for allowing Thunberg a platform to spout her "propaganda."

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On the broadcaster's decision, she said in an interview with the Express: "I was actually shocked that she was invited on that panel as an expert. I think she was even called an expert on that panel."

Seibt has zero faith in Thunberg's expertise.

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"In the case of the coronavirus, she doesn’t have a clue about what is going on and who knows the most about the coronavirus and what we should do."

“Greta doesn’t know any more than any random teenage girl who reads the mainstream news."

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Seibt then continued: “So she just spills the propaganda that she is so supposed to talk about."

Greta has since responded to Seibt's backlash...

By writing on Twitter: "I am not an expert. I am an activist. The only people claiming that I’m an “expert" are those who are trying to ridicule me. My message has always been to unite behind science and listen to the experts."

Seibt is yet to respond to Thunberg's scathing reply.

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For more on the current fight against climate change, keep scrolling to read about who claims that cannibalism is the only answer...