Who said "The time to act is now. Not tomorrow. Now."?

This quote is attributed to Greta Thunberg.

The time to act is now. Not tomorrow. Now. - Greta Thunberg

"The time to act is now. Not tomorrow. Now."

Greta Thunberg

Climate Activist, Student Swedish Born 2003 (age 23)

"Our house is on fire. I want you to panic."

"You are not mature enough to tell it like it is. Even that burden you leave to us children."

"No one is too small to make a difference."

"A lot of people want to just continue not doing anything."