WATCH: Thunberg Issues Warning to “World Leaders and Those in Power,” Vows “You have not seen anything yet”

Greta Thunberg told world leaders on Friday “I would like to say that you have not seen anything yet. You have not seen the last of us, we can assure you that” as she marched with hundreds of people in the western Swiss city of Laussane ahead of the World Economic Forum in Davos, Switzerland, next week.

The 17-year-old Swedish Climate activist and 2019 Time “person of the year” is expected to urge world and business leaders in Davos to enact stronger policies.

WATCH:

Yahoo reports Swedish activist Greta Thunberg marched with 10,000 protesters in the Swiss city of Lausanne on Friday and said “you have not seen anything yet” before some head to Davos next week to challenge the global financial elite to fight climate change.

The 17-year-old, who launched the #FridaysforFuture movement that has sparked worldwide protests, denounced a lack of government action to cut heat-trapping emissions before it is too late.

“So, we are now in a new year and we have entered a new decade and so far, during this decade, we have seen no sign whatsoever that real climate action is coming and that has to change,” Thunberg said in a speech in Lausanne.

“To the world leaders and those in power, I would like to say that you have not seen anything yet. You have not seen the last of us, we can assure you that. And that is the message that we will bring to the World Economic Forum in Davos next week.”

Protesters held signs including “Wake up and Smell the Bushfires” and “It is late but it is not too late”.