Switch off something.

Two years ago, Sydney blacked out for an hour! Last year, 400 cities across the world went dark! And these were no power cuts plunging world-class cities into darkness. It was the beginning of a revolution to save our only planet. It was Earth Hour and it's back to show that not only has this movement gained momentum, but that more than a billion people across 2,000 cities the world over will turn out the lights of their homes and offices to tell world leaders that they want something done. So, do not fret if you see the Pink City go dark between 8.30-9.30pm on March 28. [ABSTRACT FROM PUBLISHER]