The 16-year-old Swedish activist arrived by train in Spain's capital where the global COP25 UN climate conference is under way. Thunberg is due to take part in a mass march and make a speech later in Madrid.
The rallies, in Sydney and other major Australian cities, were the first in a series of protests by students across the globe demanding governments do more to protect the environment.
The International Children's Peace by KidsRights, a Dutch children's rights organisation, has been handing out the prize since 2005.
The 16-year-old's "Fridays for Future" protests which seek to bring world governments into full compliance with the Paris Climate Accord have become a global phenomenon.
Indonesia's plastic puppets at Sasak Puppetteer School are teaching children to protect the environment.
The 81-year-old film star, a longtime activist and exercise guru has been leading what she calls "fire drill Fridays" and has been arrested for civil disobedience for the past three Fridays.
Scientists William Kaelin, Peter Ratcliffe, and Gregg Semenza won the accolade for their body of work on how cells sense and adapt to the availability of oxygen, the award-giving body says.
The 16-year-old Swede met privately with Trudeau but later told a news conference with local indigenous leaders that he was "not doing enough" to curb greenhouse gases responsible for global warming.
Saudi Aramco is a massive contributor to climate change and at the same time, actively thwarts international efforts at mitigation.
The young Afghan environmentalist was selected as one of 100 ‘green ticket’ winners by the UN. But he couldn’t attend the summit as the US denied his entry saying he was ineligible for a nonimmigrant visa.
Some 60 world leaders gather at UN for a "climate emergency" summit aimed at reinvigorating the faltering Paris agreement, at a time when mankind is releasing more greenhouse gases into the atmosphere than at any time in history.
Youths gathered at at the Youth Climate Summit at United Nations HQ by demanding radical moves to fight climate change.
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