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The sisters say they were inspired by figures such as Nelson Mandela, Princess Diana, and Mahatma Ghandi when at school.
Greenland is a semi-autonomous part of the Kingdom of Denmark and Copenhagen runs the island's defence through its Joint Arctic Command.
Glaciers in the Himalayas are retreating but some are also advancing which proves that global warming is not the only reason behind the phenomenon.
Heatwaves and droughts will pose the greatest threat in the next decade, as temperatures continue to rise due to heat-trapping gases, experts said.
The Lahaul valley is known for growing prized seed potatoes whose history goes back to 1854 when missionary A W Hide from Germany established a farm there.
In India, clouded leopards are restricted to the country's northeast region - the eastern Himalayas, the Assam valley, and the hills south of the Brahmaputra.
The fastest running predator which became extinct in the country during the 1950s, are set to be relocated and may be put up either in Madhya Pradesh or in Rajasthan.
Actor couple Chris Hemsworth and Elsa Pataky joined conservation groups to release 11 of the animals into a wildlife sanctuary in New South Wales.
The country's worst summer of bushfires in a generation razed more than 11.2 million hectares (27.7 million acres), nearly half the area of the United Kingdom.
Ever since Delhi Chief Minister Arvind Kejriwal announced transplantation of trees, it has remained a controversial decision.
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