Greta Thunberg has turned down an environmental award and prize money because "the climate movement does not need any more awards".
She thanked the Nordic Council for offering her the award and said it was a "huge honour".
But, she said, "politicians and the people in power" need to listen to the "current, best-available science".
Also, Greta Thunberg was this year's favourite to win the Nobel Peace Prize, but the award went to Ethiopia's Abiy Ahmed.
In an Instagram post explaining her decision to turn down the prize money of 500,000 kronor ($51,500, £40,000; €36,000), Thunberg said:
"The Nordic countries have a great reputation around the world when it comes to climate and environmental issues.
"There is no lack of bragging about this. There is no lack of beautiful words."
But she said Nordic energy consumption told "a whole other story".
She referenced a report from from WWF and the Global Footprint Network, which says Sweden, along with most of the Nordic region, lives as if the world has the resources of four planets.
The gap between what science said was needed to limit a global temperature increase and what was being implemented was "gigantic", said Greta Thunberg.
"We belong to the countries that have the possibility to do the most. And yet our countries still basically do nothing," she added.
The Nordic Council encourages co-operation between parliaments in countries including Denmark, Finland and Thunberg's home country Sweden.