Thomas Bielby, 16, from Middlesbrough, was selected by a panel of children and young people based on a DVD he made on climate change. He held a town-wide questionnaire to gather the views of young people on what adults, schools, pupils and the government can do to tackle climate change.
"This is a rare opportunity for children to share their ideas on tackling climate change with world leaders," says Lucy Read, project co-ordinator at NCB.
"It is important that children in the UK can take a more global perspective and understand the needs of their peers in developing countries."
The conference will also give the teenagers experience of global decision making as they shadow their country delegates, sit in on conference sessions and talk at conference events.
This year's UN conference on climate change will discuss a successor to the Kyoto Protocol, the legally binding framework on greenhouse gas emissions.
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