It might seem difficult to sum up an entire year using only five words, but Greta Thunberg completed the task with ease.

Inspired by #2019in5words, the latest end of year hashtag to trend on Twitter, the 16-year-old climate activist tweeted one of her most powerful quotes: "Our house is on fire."

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Thunberg spoke those five words at Davos 2019 earlier this year when delivering a blunt climate warning to a room full of the world's most powerful leaders.

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The teen's actions in 2019 have not only gotten her named Timemagazine's Person of the Year, but they've inspired many people, including actress and activist Jane Fonda, to fight the dire climate crisis that's facing our planet head on.

SEE ALSO:Greta Thunberg celebrates returning home to Sweden with pic of her lovely doggos

Several other people used the #2019in5words hashtag to celebrate Greta's impact this year.

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Of course not everyone is using it to praise Greta. Some are looking back on the biggest highs and lows of the year.

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Excited to see 2020 memes. #2019in5words