Greta Thunberg returned to the World Economic Forum a year after famously observing that "our house is on fire" with a familiar warning.

The Swedish climate activist spoke Tuesday at the World Economic Forum in Davos, Switzerland, returning to the event after saying in a 2019 speech there that "our house is on fire." Opening a panel called "How to Save the Planet: Averting a Climate Catastrophe," Thunberg recalled her speech a year ago while advocating for "radical emission cuts at the source, starting today."

"From a sustainability perspective, the right, the left as well as the center have all failed," Thunberg said. "No political ideology or economic structure has been able to tackle the climate and environmental emergency and create a cohesive and sustainable world. Because, in case you haven’t noticed, that world is currently on fire."

Thunberg went on to blast what she referred to as being "worse than silence" from leaders: "empty words and promises which give the impression that sufficient action is being taken." She also asked leaders at the forum "what will you tell your children was the reason to fail and leave them facing the climate chaos you knowingly brought upon them?"

She concluded by echoing her previous warning, saying, "Our house is still on fire. Your inaction is fueling the flames by the hour. We are telling you to act as if you loved your children above all else."

Thunberg spoke after an address from President Trump, who said "we must reject the perennial prophets of doom and their predictions of the apocalypse." Brendan Morrow