Protesting has become a weekly obligation.

Last weekend, thousands of scientists and science enthusiasts descended onto the nation's capital to champion math, science and the pursuit of knowledge and information. This weekend, the protesting continued.

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From New York and Chicago to Minneapolis and Savannah, thousands took to the streets on Saturday to march in protest against President Donald Trump's environmental policies.

Protestors reportedly yelled chants, such as "the oceans are rising and so are we" and "we will not go away, welcome to your 100th day."

Organized by the Peoples Climate Movement, a project comprised of 50 organizations, and backed by the support of hundreds of partner groups, the goal of the protests on Saturday was to show the Trump administration that the "resistance is not going to wane or fade way," according to the march's website.

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Trump has not ingratiated himself with the science community since he became president 100 days ago. His administration has issued executive orders that have rolled back clean energy initiatives started by his predecessor. Trump's EPA chief, Scott Pruitt, has flat out denied that human activity has led to global warming.

As the president contemplates pulling out of the Paris climate agreement, thousands of protestors from around the country made sure it was known Saturday that they were going to fight for the climate.

Check this out: this is one BIG #climatemarch in DC! pic.twitter.com/ZgEe8wZqRU — Peoples Climate (@Peoples_Climate) April 29, 2017

"The D.C. #ClimateMarch is going to be huge." "Traffic is going to be snarled." I was skeptical. But they were right, this is a big crowd pic.twitter.com/PAKVsPPLWg — Brian Stelter (@brianstelter) April 29, 2017