DENVER -- Hundreds of people, young and old, gathered at Union Station Friday morning to begin their march to the Colorado State Capitol during the worldwide "Climate Strike."
An overwhelming amount of children and teenagers were present during the march and demanded an end to fossil fuels an a continued focus on solutions to climate change.
Will O'Grady and his brother Evan say it's important for them to be a part of the protests because they want to secure their futures on this planet.
"Because if we don't do it, then when I grow up and he grows up we won't have a very nice place to live in and we'll have to clean up what these people made," said Will.
Currently in the fifth grade, Claire Kloster says even though she can't vote, she still wants her voice to be heard.
"I think it's important that I'm here because even though I may not do anything, it'll show more people that kids and grown-ups care and that anybody who wants to can take action and save our world."
This protest was one of hundreds happening across the world. There are more events planned for the rest of the week across Denver and Colorado.
Organizers estimate more than 7,500 people joined in the strike.