Swedish climate activist Greta Thunberg has been named as Time Magazine's Person of the Year for 2019.
Greta, 16, was praised by the publication for starting an environmental campaign in August 2018, which became a global movement.
She initially skipped school and camped out in front of the Swedish Parliament to demand action before making headlines worldwide.
The teen, who turns 17 in January, is known for her blunt, straightforward speaking manner - which has even riled up Jeremy Clarkson.
Her accolade was announced on NBC's Today show.
Editor-in-chief Edward Felsenthal told the programme: "She became the biggest voice on the biggest issue facing the planet this year, coming from essentially nowhere to lead a worldwide movement."
He added that the teen is the magazine's youngest choice ever to be named Person of the Year.
And the special edition of the magazine has emerged showing her on the front page with the slogan 'the power of youth'.
The magazine added: "In the 16 months since, she has addressed heads of state at the U.N., met with the Pope, sparred with the President of the United States and inspired 4 million people to join the global climate strike on September 20, 2019, in what was the largest climate demonstration in human history.
"Margaret Atwood compared her to Joan of Arc. After noticing a hundredfold increase in its usage, lexicographers at Collins Dictionary named Thunberg's pioneering idea, climate strike, the word of the year."
Just a few days ago, she criticised governments at the UN climate talks for avoiding taking action to cut greenhouse gas emissions.
In a speech at the COP25 talks in Madrid, Spain, the Swedish teenager, who inspired the worldwide school strikes for climate movement, said: "Our leaders are not behaving as if we are in an emergency."
She said the science showed that, at the current rate of emissions, the world is set to use up the whole "carbon budget" - the amount of pollution that can be put into the atmosphere and still keep global warming to 1.5C - in eight years.
Countries previously committed to curbing global warming at "well below" 2C above pre-industrial levels and to pursue efforts to keep temperature rises to 1.5C in the Paris Agreement secured in 2015.
Greta warned that "even at 1C people are dying from the climate crisis" and the science showed that going beyond 1.5C risks destabilising the climate and hitting irreversible tipping points such as melting glaciers and permafrost.
She said: "Finding holistic solutions is what the COP should be all about, but instead it seems to have turned some kind of opportunity for countries to negotiate loopholes and to avoid raising their ambition.
"Countries are finding clever ways around having to take real action, like double-counting emissions reductions, and moving emissions overseas, and walking back on their promises to increase ambitions, or refusing to pay for solutions or loss and damage.
"This has to stop."
Greta, who sailed across the Atlantic to attend the talks in Chile, before having to sail back again because they were moved to Spain due to civil unrest in the South American country, has made a series of hard-hitting speeches at international events in the past year.
The teenage activist also previously said: "Every great change in history comes from the people. We can start the change right now, we the people."
