On Earth Day (April 22), thousands of scientists and people worldwide took to the streets for a “March for Science”, to highlight the importance of scientific research, and the role it plays in people’s lives.

Concerned individuals used the march’s opportunity to criticize Trump’s agenda on the environment, displaying placards such as “Science not Silence”, “Make Earth Great Again”, and “Science is not an alternative fact”.

During his campaign and presidency, Trump has been vocal about his views on climate change , including calls to remove the U.S. from the COP21 agreement and eliminate the Clean Power Plan, in addition to hopes of reviving America’s coal industry.

The appointment of Scott Pruitt as the EPA’s administrator has also been seen as controversial. In March, Pruitt made headlines after he told CNBC that he didn’t believe carbon dioxide was a primary contributor to global warming – a view that contradicts the public viewpoint of the EPA agency itself.

Following the March for Science, thousands are expected to gather on April 29 for the People’s Climate March.