21 March 2013 at 3.17pm | Comment on this article
On Saturday 23 March, the Royal Opera House will join hundreds of millions in a global 'lights off' to celebrate Earth Hour, the world's largest public action for the environment.
External lights will be switched off between 8.30-9.30pm GMT with an additional 'sweep' of the building to ensure that no internal lights in areas and offices not in use have been switched off. The evening's performance of Tosca will see lights dimmed during the first interval.
Working with environmental non-profit consultancy Julie's Bicycle, the Royal Opera House has an environmental action plan which aims to tackle climate change.
Find out more about Earth Hour: