Greta Thunberg, the pioneer of climate activism, turns 18

August 20, 2018: Swedish student Greta Thunberg, then aged 15, skips school to protest outside parliament for more action against climate change.

September 2018: Thunberg begins a regular ''strike'' from classes every Friday to protest climate issues. She invites other students to join her weekly "Fridays for Future" campaign by staging walkouts at their own schools.

January 25, 2019: Swedish youth climate activist Greta Thunberg delivers a speech during the closing day of the World Economic Forum (WEF) annual meeting in Davos, eastern Switzerland. 

March 2019: she is nominated for a Nobel Peace Prize. 

August 14, 2019: Thunberg sets sail from Britain for the United States to take part in a United Nations climate summit. 

September 13, 2019: she takes her mission to U.S. President Donald Trump's doorstep with a protest outside the White House.

September 18, 2019: she is one of four students invited to a US congressional hearing to provide the next generation's views on climate change.

September 25: she berated world leaders as she addressed a UN climate summit on Monday, accusing them of betraying her generation by failing to tackle greenhouse gas emissions and asking "How dare you?"

December 2019: she is named the world's most influential person by Time magazine, appearing on its cover. 

Thunberg took to Twitter to thank people for their wishes and saying we can find her at a local pub exposing "dark secrets"

"Thank you so much for all the well-wishes on my 18th birthday! Tonight you will find me down at the local pub exposing all the dark secrets behind the climate- and school strike conspiracy and my evil handlers who can no longer control me! I am free at last!!", said Thunberg.