Cities around the world observed a one hour black-out on Wednesday to raise awareness of the dangers of climate change.

Hundreds marched through the streets of Copenhagen as lights were switched off. The event was organized to coincide with the climax of climate talks in the Danish capital.

One-hundred-and-93 nations remain deadlocked in talks to reach a deal on curbing global warming.

The 10-day-old talks ran into disputes as they entered a critical stage on Wednesday, just two days before more than one-hundred national leaders hope to sign an historic agreement.