A teacher in the United States has been put on administrative leave after making some sickening remarks about climate change activist Greta Thunberg.

The 16-year-old was visiting Iowa City for a climate action event and on Facebook asking if anyone was attending, Waterloo West High teacher Matt Baish commented: “Don’t have my sniper rifle”.

“We wanted to make you aware of a social media situation involving one of our employees,” a letter from the school said.

“The nature of the content shared rose to the level of putting this employee on administrative leave pending an investigation. We appreciate your patience as we sort through the details and thank you for respecting the process.”

Mr Baish’s comment has since been removed.