An ex-employee of the Badlands National Park posted a series of messages about climate change Tuesday, a park service official said. The act was seen by many as a protest against President Donald Trump's position on climate change.

The three tweets that referred to climate change, an issue that Trump has called a hoax, were unauthorized and the park removed them without being asked after realizing the account was compromised, a National Park Service official who did not want to be named said.

The messages posted to the Twitter account of the South Dakota park comes after the Department of Interior was reportedly ordered to cease using Twitter after retweeting side-by-side photos comparing the crowd size of Barack Obama's first inauguration to Trump's.

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"The pre-industrial concentration of carbon dioxide in the atmosphere was 280 parts per million (ppm). As of December 2016, 404.93 ppm.," a tweet on the Badlands park account said.

Another read, "Today, the amount of carbon dioxide in the atmosphere is higher than at any time in the last 650,000 years. #climate."

At roughly 5:30 p.m. on Tuesday, the tweets disappeared from the Park's Twitter account.