Rio de Janeiro, Copacabana. Photo source: ©© Alex de Carvalho
At 8:30pm on Saturday 26 March 2011, landmarks across the world switched off their lights for one hour in a bid to highlight global climate change.
View 26 Photos Gallery, from Paris to Singapore: VIEW GALLERY, Guardian UK
Gathered here are an other series of before-and-after photographs from this year, which (starting with the second one below) will fade between “on” and “off” when clicked.
View Fading Photos Gallery: VIEW GALLERY, Boston Pictures