She shot to fame when she launched the first 'School Strike for Climate' outside the Swedish parliament building in her crusade to raise awareness about global warming.
Since then, 16-year-old Greta Thunberg, from Stockholm, Sweden, has become the poster girl for an international youth movement and has even addressed a UN climate council and the EU parliament.
On 20 August, when Greta first staged her famous protest that brought her to prominence, she vowed she would refuse to attend school until Swedish politicians took action.
Greta's strike was inspired in part by the heatwaves and wildfires that were widespread in Sweden during the summer of 2018 - the hottest since records began 262 years before.
However, her interest in climate change began long before 2018. Greta said that she first heard about climate change aged eight and could not understand why so little was being done about it.
Her strike has gone on to inspire young people around the world, leading tens of thousands of students from Germany, Japan, Australia and Ireland.
Greta has energised young people with her climate movement, 'Fridays for Future', where students vowed to boycott school on Fridays until their countries agreed to honour the 2015 Paris agreement.
She also participated in various public demonstrations, including when she spoke at TEDxStockholm on 24 November 2018.
During her speech she said didn't want to become a climate scientist because only denial, ignorance and inaction remained.
She said that her children and grandchildren would ask her why they has not taken action in 2018 when there was still time, she concluded with 'we can't change the world by playing by the rules, because the rules have changed.'
The video of Greta’s speech has since been viewed 1.4m times on YouTube.
Greta soon gained more support for her movement. On 15 March this year, it is estimated that a total of 1.6m students from 125 countries, walked out of school to demand climate change action.
In Ireland, thousands of students across the country took part in the demonstrations with the main actions taking place in Dublin and Cork.
However, students from schools in many towns around the country also held demonstrations.
In September, Greta plans to cross the Atlantic Ocean on a racing sailboat to attend the UN climate summit in New York.
It will be her first visit to the US since she launched her environmental drive a year ago.
Once in the US she is to take part in large scale demonstrations on 20 and 27 September and speak at the United Nations Climate action Summit.
