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Actor Leonardo DiCaprio was named UN representative for climate change last week.

Thousands of people took to the streets in various cities around the world to demand urgent action against climate change.

The first demonstrations took place in Australia, as part of a global mobilization that included nearly 2,000 marches.

The protesters argue that if greenhouse gas emissions are not reduced the world will experience more droughts, forest fires and storms.

The protests culminated in New York where the United Nations Secretary General Ban Ki-moon, celebrities, business leaders and environmentalists participated.