
Actor Leonardo DiCaprio joined thousands of climate change protesters in Washington DC to mark President Donald Trump's 100th day in office.

Large crowds gathered on Pennsylvania Avenue for the People's Climate March, an event that saw about 300 coinciding protests around the country, according to organizers.

The mercury rose to around 90F in DC, and protesters brought their own water bottles and sunscreen as they warned about the dangers of global warming.

Holding signs that read 'There is no planet B', and 'Make Earth Great Again', the protesters say they're objecting to the president's rollback of restrictions on mining, oil drilling and greenhouse gas emissions at coal-fired power plants, among other things.

Scroll down for video

Actor Leonardo DiCaprio joined thousands of climate change protesters in Washington DC to mark President Donald Trump's hundredth day in office

The actor, known for his environmental activism, held a sign that read 'Climate change is real' while marching alongside indigenous people from North and South America

Large crowds gathered on Pennsylvania Avenue for the People's Climate March, an event that saw about 300 coinciding protests around the country, according to organizers

The mercury rose to around 90F in DC, and protesters brought their own water bottles and sunscreen as they warned about the dangers of global warming

Pictured left, protesters with signs that read 'POTUS' hot air not helping. Sad.' while men with cartoon suns hanging on their backs held a 'resist' banner

Pictured left, a protester dressed as Trump, ready to strike Earth with a golf club. And right, a banner in front of the US Capitol declaring 'We are the guardians of the future'

Participants say they're objecting to Trump's rollback of restrictions on mining, oil drilling and greenhouse gas emissions at coal-fired power plants, among other things

The protests were coordinated to coincide with Trump's hundredth day in office. The People's Climate March first kicked off in 2014 and has now grown to become a global event

Demonstrators in Washington started their march near the Capitol and slowly made their way to the White House. Pictured, one participant in a Trump paper mache head spewing what appears to be fiery air at the earth

While many of the signs delivered ominous messages, the mood at the march in DC was upbeat and jovial, with

In a reference to Maya Angelou's famous poem, one protester held a sign that read: 'Like the sea level we rise'

In Augusta, Maine, more than 2,000 protesters gathered outside the statehouse, where a lobsterman, a solar company owner and members of the Penobscot Nation tribe spoke. Pictured, protesters in DC

Demonstrators in Washington started their march near the Capitol and slowly made their way to the White House.

DiCaprio, known for his environmental activism, marched alongside people indigenous to both North and South America while carrying a sign that read: 'Climate change is real'.

He tweeted on Saturday: 'Honored to join Indigenous leaders and native peoples as they fight for climate justice. Join me in standing with them.

Model Christie Brinkley also joined a march in the Hamptons, where she wore a flower headpiece and held a sign that read: 'Let's make everyday a good air day'.

Model Christie Brinkley also joined a corresponding march in the Hamptons, where she wore a flower headpiece and held a sign that read: 'Let's make everyday a good air day'

Brinkley wrote on her Instagram account: 'The Past 100 Days has mobilized a passionate and committed group of people who ARE RISING to the occasion.. standing up for our planet, our beautiful Mother Earth and all her sentient beings!'

In Augusta, Maine, more than 2,000 protesters outside the statehouse said they wanted to draw attention to the damage climate change can cause marginalized communities.

Speakers included a lobsterman, a solar company owner and members of the Penobscot Nation tribe.

'I've seen firsthand the impacts of climate change to not only the Gulf of Maine, but also to our evolving fisheries, and to the coastal communities that depend upon them,' said lobsterman Richard Nelson, of Friendship, Maine.

People in the crowd spoke about the importance of addressing climate change to industries such as renewable energy, forestry, farming and seafood.

Saharlah Farah, a 16-year old immigrant from Somalia who lives in Portland, addressed the ways in which climate change could have a bigger toll on marginalized groups that have less financial resources.

'But I see untapped power here today,' she said.

In Tampa, Florida, a demonstration stretched for several blocks, Marchers said they were concerned about the threat rising seas pose to the city.

Meanwhile, in Boston, a crowd gathered in public park in downtown. Marchers carried signs with slogans such as 'Dump Trump.'

In Boston, a crowd gathered in park in downtown. Marchers carried signs with slogans such as 'Dump Trump'

On Friday, a federal appeals court postponed a ruling on lawsuits challenging provisions of former President Barack Obama's plan to reduce emissions from power plants. Pictured, the protest in Boston

On Friday, a federal appeals court postponed a ruling on lawsuits challenging provisions of former President Barack Obama's plan to reduce emissions from power plants.

The Environmental Protection Agency sought to put the legal fight on hold after Trump signed an executive order to roll back the plan.

The EPA also announced on Friday it would revamp its website, and information about climate change has already been taken down.

A message was left on the page that said: 'We are currently updating our website to reflect EPA's priorities under the leadership of President Trump and Administrator Pruitt.'

And it remains to be seen whether Trump will make good on his campaign promise to withdraw from the 2015 Paris climate accord signed on by 200 nations.

The president has previously claimed climate change is a hoax, although it was reported in early December First Daughter Ivanka wants to back the issue.

She met with former Vice President Al Gore, who won the Nobel Prize for his climate change work.

In Chicago, crowds braved the rain to march from Federal Plaza to Trump Tower. The EPA has already taken down information about climate change from its website

Pictured, protesters in Chicago keeping dry. Left, a sign that reads: 'Cherish me! Protect me! Save me! Preserve me! and right, an umbrella adorned with inflatable globes

It remains to be seen whether Trump will make good on his campaign promise to withdraw from the 2015 Paris climate accord signed on by 200 nations

'It's no secret that Ivanka Trump is very committed to having a climate policy that makes sense for our country and for our world,' Gore told MSNBC's Chris Hayes after a meeting with Ivanka and her father.

'That was certainly evident in the conversation that I had with her before the conversation with the president-elect,' Gore said. 'I appreciate the fact that she's very concerned about this.'

Donald Trump has claimed that climate change is a hoax. Chief of Staff Reince Priebus has said that the president still believes that 'most of it is a bunch of bunk.'

A general protest of Trump titled 'The 100 Days of Protest' took place in New York City, which also attracted pro-Trump counter protesters