New York, Sep 21 - A 13-year-old Indian girl from Lucknow, Yugratna Srivastava has won the honour to address US President Barack Obama, President Hu Jintao of China and other world leaders on behalf of the world's three billion youth and children.

The UN summit that Yugratna would address Tuesday is part of the UN Secretary General Ban Ki-moon's campaign to bring about a fair and ratifiable green house gas reduction agreement at this year's Climate Conference in Copenhagen, Denmark.

'World leaders must recognise the energy and potential which lies in children and youth. This age group is just like flowing rivers and they make their own way in the direction in which they march,' said Yugratna, a lively, committed and very passionate teenager.

Yugratna became sensitised to environmental protection in Grade 6 in St. Francis School in Shamli, India. It was there that she joined 'Tarumitra' (Friends of Trees).

The non-governmental organisation works hard to stop the felling of trees and forests, builds roadside gardens and cleans up garbage dumps, among other activities.