See photos from the People's Climate March in Denver
DENVER, CO - APRIL 29: Thousands of protestors gather in Denver Civic Center Park at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Loise Gilmer of Parker, Colorado protests at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Michael Alcazar of Denver, Colorado at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Joe McGregor, 66, of Denver, Colorado holds a resist sign at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Stan Gelb and his wife Beth Utton, both of Longmont, Colorado, hold signs while protesting at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Meteorologist Lis Cohen of Denver, Colorado holds a sign while cheering on protesters at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors gather in Denver Civic Center Park at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors march around downtown Denver at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors gather in Denver Civic Center Park at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors march around downtown Denver at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Leah Stein of Parker, Colorado holds a sign while protesting at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors march around downtown Denver at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty
DENVER, CO - APRIL 29: Thousands of protestors march around downtown Denver at the People's Climate March on Denver on April 29, 2017 in Denver, Colorado. The protest, which focused on climate change, coincided with President Donald Trump's 100th day in office. (Photo by Marc Piscotty/Getty Images)Marc Piscotty