Across the world people are asked to switch off their lights for one hour to draw attention to climate change.
2009 is United Nation's International Year of Astronomy, 'Earth Hour’ is about highlighting the damaging impact of Light Pollution on our night skies.
It’s a colossal waste of energy. It’s also wiping out something of immeasurable richness for up to two thirds of the world’s population.
For Professor Mark Bailey, Director of Armagh Observatory, a clear night sky can almost mentally transport you into infinity.
You can actually see millions of light years with the naked eye.
At half-past eight tomorrow night, in Ireland and across the globe, people are being asked to switch off our lights for an hour to try a little darkness. However, the message has not fully hit the streets and many Dubliners are unaware of what Earth Hour is and others will be watching the Republic of Ireland take on Bulgaria in a World Cup qualifier at a floodlight Croke Park.
An RTÉ News report broadcast on 27 March 2009. The reporter is Emma O’Kelly.