A girl holds a hurricane lamp during the Earth Hour Copenhagen in the capital city of Denmark, on December 16, 2009. The Earth Hour Copenhagen event calls for households and businesses in the city to turn off their non-essential lights and other electrical appliances for one hour, aiming to raise awareness of the need to take action on climate change. [Xinhua]

A girl holds a hurricane lamp during the Earth Hour Copenhagen in the capital city of Denmark, on December 16, 2009. The Earth Hour Copenhagen event calls for households and businesses in the city to turn off their non-essential lights and other electrical appliances for one hour, aiming to raise awareness of the need to take action on climate change. [Xinhua]