Glasgow CNN  — 

Greta Thunberg criticized world leaders and called the COP26 summit a “failure” on Friday, as she led a huge youth protest outside the venue of the climate summit in Glasgow.

Young activists poured into the Scottish city to demand action from leaders, as the focus of the official event turned toward the impact of climate change on future generations.

But in the headline speech of the demonstration, Thunberg told crowds that “history will judge them poorly,” calling the pivotal conference “a global north greenwash festival” and “a two-week long celebration of business as usual.”

“Many are starting to ask themselves, what will it take for the people in power to wake up? But let’s be clear: they are already wake. They know exactly what they are doing,” she said.