Rally organizers are also anxious by what they see as growing skepticism from politicians and others on topics such as vaccinations, genetically modified organisms and evolution. "And this war on science is only going to cut us off at the knees".
The Omaha march is part of similar events around the world meant to promote the understanding of science and defend science from attacks such as proposed us government budget cuts.
Behrooz Bajestani, left, and Austin Willoughby hold signs calling for environmental policies to protect against climate change.
Thousands took part in more than 600 marches around the country and in other nations around the world.
Allison Rahs is a middle school science teacher who also attended Saturday's rally. Previous year the United States, under President Barack Obama, joined more than 190 other countries in signing the pact.
Critics like Mann see the Trump administration's cutbacks at the Environmental Protection Agency and other government programs as a serious threat.
"We need to go to county fairs, and we need to personalize the scientific issues we care about", said geologist Rob Young, a professor at North Carolina's Western Carolina University.
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Demonstrators gather at the Washington Monument before marching to the U.S. Capitol during the March for Science on Saturday.
Berlin saw several thousand people march from one of the city's universities to the Brandenburg Gate.
While organisers did not attack Donald Trump's adminstration, they said that it had "catalysed" the movement. The sign showed the periodic table of chemical elements and said: "You're out of your element Donny (Trump)".
Despite saying the march was not partisan, Holt acknowledged it was only dreamed up at the Women's March on Washington, a day after Trump's January 20 inauguration. In March, he said he does not believe carbon dioxide is a primary factor in global warming, a view which is at odds with nearly all climate scientists. And that seems to be galvanizing people in a way it never has before.
The scientists and their supporters say they are well aware change doesn't happen overnight.
At the headlining event for the worldwide protest in Washington D.C., speakers criticized the new presidential administration, and protesters held signs targeting the president.
Sarah Evangea, director of the Cornell Alliance for Science, said her organization worked as an official partner of the march to bring greater awareness of climate change and the "scientific consensus" about the safety of vaccines and genetically modified crops.
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