Some stunning shots from the environmental photographer of the year awards including this image by Florian Breuer of quiver trees by night in Namibia. Check out +environmentguardian for more.

And the US takes gold again! A light shines behind President Barack Obama as he speaks during a campaign event in Iowa Photograph: Carolyn Kaster/AP

Source: YouTube/SOHfestival

An installation light projection on Australian landmark the Sydney Opera House makes it look as if its roof crumbles to the ground. The display forms part of the Vivid light and music festival in the New South Wales capital, and is created by the German design company Urbanscreen

Earth Hour plunges global landmarks into darkness

Iconic buildings across the world including the Eiffel Tower in Paris and the Opera House in Sydney turn off their lights as part of Earth Hour. Held on the last Saturday of March each year, the event highlights environmental concerns by inviting people to switch off non-essential lighting