On March 28th, 8.30pm, almost 4000 towns and cities across 88 countries visibly demonstrated their growing concern over climate change by turning off their lights for 1 hour.
This was Earth Hour. A huge, global, symbolic action that sent a clear signal to our nations' leaders to say that climate change is important.

 That it matters a great deal to us all.

 That we care.

http://www.earthhour.org/