Labour has also gone on the attack on Boris Johnson after the government failed to bring urgent plans to tackle the climate and environment emergency in time to meet the six month deadline set by parliament.
The 16-year-old had declined another award in 2018 because many of the finalists had to fly to Stockholm for the ceremony.
The Duchess of Sussex attended the One Young World conference opening ceremony on Tuesday.
They are marching, flying and hopping in their droves because of climate change, say scientists.
We are stuck in a fossil-fuel economy and without systemic change, our lifestyles will keep on causing climate and ecological harm.
The latest action is part of two weeks of disruption demanding urgent moves to protect wildlife and the climate.
Health professionals dressed in scrubs took part in a demo in London.
Nature’s ability to meet the needs of those who need it the most - such as people in coastal communities or reliant on farming - is dwindling, according to the research
“I regard it as a tremendous compliment to be called an unco-operative crusty", the Prime Minister's father said.