Sen. Bernie Sanders and other Vermont leaders spoke Monday morning at the University of Vermont's Youth Rally for Climate Action.

Sanders says the global threat of climate change will take millions of people, particularly young people, to come together and take action. He wants the U.S energy system to move away from fossil fuels and move toward clean energy.

He also used the opportunity to criticize President Donald Trump and the Republican Party on climate change.

"You have a Republican Party today, many of whom actually know better but do not have the guts to stand up and say what is absolutely true, that climate change is real and human activity," said Sanders, I-Vermont.

Rep. Peter Welch and Lt. Gov. David Zuckerman also spoke at the event.