In case you haven't visited Google today you will not have seen they have turned the lights out on their home page. Was a bit disconcerting as I banged in the G before finding my way to the search box.
The reason for this is that they are supporting Earth Hour which is encouraging people to turn off their lights today between 8pm and 9pm today. It is to highlight the need for greater energy conservation world wide. Sydney has already taken part turning the lights out on the Opera House and Harbour Bridge and many more locations will do so during the day.