Scientists are planning a major demonstration on the National Mall in Washington, D.C. soon, scheduling it to take place on April 22, which is Earth Day. The scientists will be demonstrating for evidence-based research and the scientific method, and doing it in the face of a president who has attempted to upend efforts to combat global warming and climate change.

The march comes on the heels of the massively successful Women’s March on Washington, which drew half a million people to the nation’s capital. The march of scientists has been prompted by news that Donald Trump’s administration was telling government researchers to stop communicating to the public.

A total of 40,000 have apparently signed upt o participate in the project. The march will feature a rally on the mall with speakers, as well as tents where scientists will be able to share their research with the public.

“The March for Science is a celebration of our passion for science and a call to support and safeguard the scientific community,” the march’s website states. “Recent policy changes have caused heightened worry among scientists, and the incredible and immediate outpouring of support has made clear that these concerns are also shared by hundreds of thousands of people around the world. Mischaracterization of science as a partisan issue, which has given policymakers permission to reject overwhelming evidence, is a critical and urgent matter. It is time for people who support scientific research and evidence-based policies to take a public stand and be counted.

“We are scientists and science enthusiasts. We come from all races, all religions, all gender identities, all sexual orientations, all abilities, all socioeconomic backgrounds, all political perspectives, and all nationalities. Our diversity is our greatest strength: a wealth of opinions, perspectives, and ideas is critical for the scientific process. What unites us is a love of science, and an insatiable curiosity. We all recognize that science is everywhere and affects everyone.”