Hundreds of other marches sprung up around the USA and globally. Demonstrators march on the State Street during "100 Days of Failure" protest and march, Saturday, April 29, 2016, in Chicago.
(AP Photo/Nam Y. Huh). Many at the People's Climate March are angered at Trump's moves to rollback environmental protections put in place by the previous administration.
A page that explained the causes and effects of climate change has been removed from the Environmental Protection Agency's website. However, what is most alarming to these marchers is Trump's appointments to his cabinet and his proposed budget cuts to scientific and environmental organizations.
John O'Grady is president of the American Federation of Government Employees Council 238.
On a hot day, tens of thousands of demonstrators assembled in Washington for the latest installment of the regular protests that punctuate the Trump era.
Among the participants on Saturday were public figures like actor Leonardo DiCaprio and former Vice President Al Gore.
The principal organizers of the march, the People's Climate Movement held its first march in 2014 in New York City at the height of the fight over the Keystone XL pipeline.
The crowds will reconvene at the Washington Monument grounds to listen to music and speakers from around the country, including an indigenous community leader from the Gulf Coast, an Iraq war veteran, a SC pastor, a Muslim imam, a Las Vegas student and a nurse affected by Hurricane Sandy, according to organizers. Bernie Sanders, I-Vt., called the marches part of a fight for the future of the planet.
In December 2015, the US joined almost 200 other countries to sign the Paris climate deal, aimed at keeping temperature rise within a somewhat safe level.
"We have inadequate protections of our water, our air we have a reliance on fossil fuels, which are risky, which can't be moved safely, which can't be burned safely - which are causing climate catastrophe and pollution", said Victoria Ross of the Western New York Peace Center".
But he also noted a series of accomplishments that include ever-dropping costs of renewable energy production and well-paying jobs in renewable power.
"We've already seen just how effective people power is against this administration: Trumpcare?"
Dozens of "sister" marches are planned for other North America locales, from Annapolis Royal, Nova Scotia, to Dutch Harbor in Alaska's Aleutian Islands.
It also came on the heels of the larger March for Science, which brought out more than 10,000 people to the State Capitol in St. Paul last week. Speakers included a lobsterman, a solar company owner and members of the Penobscot Nation tribe.
Trump's 100th day in office wouldn't be complete without the persistent reminder of just how much the man is disliked, his harmful policies hated and his illegitimacy not even close to being forgotten.