Em sua 5ª edição, a Hora do Planeta de 2011 aconteceu no sábado do dia 26 de março a partir das 20:30h. O movimento anti-aquecimento global é liderado pela ONG internacional WWF (World Wildlife Fund). O movimento mobiliza pessoas e até países inteiros ao redor do mundo, num grande flashmob ecológico. Até mesmo grandes pontos turísticos, como por exemplo a Ópera de Sydney e a Muralha da China participaram da campanha. Veja as fotos do “antes” e “durante” a Hora do Planeta de 2011 (e aproveite para ver também as fotos da Hora do Planeta de 2010).
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