You are using an older browser version. Please use a supported version for the best MSN experience.

The world marks Earth Hour, but are leaders doing enough to fight climate change?

Cities all over the world turned off their lights to mark Earth Hour, but a new climate change warning from the United Nations says "humanity is on thin ice." CNN's Kim Brunhuber speaks with Henna Hundal, a delegate to the UN Climate Change Conference.
image beaconimage beaconimage beacon