Harbour_Panorama

Earth Hour is an international event that asks households and businesses to turn off their lights and non-essential electrical appliances for one hour on the evening of 29 March at 8 pm local time until 9 pm to promote electricity conservation and thus lower carbon emissions. It may also help reduce light pollution, and in 2008, coincides with the beginning of National Dark Sky Week in the USA. ( wiki )

A panorama of the harbour bridge.