Last week, a series of flash floods and mudslides struck the Serrana mountain region near Rio DE Janeiro, Brazil, destroying buildings roads and more.

上周，一系列的骤发洪水和泥流在巴西里约热内卢附近的塞拉纳山地区爆发，建筑、道路等被破坏。

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Aerial view of an isolated area severely hit by landslides near Teresopolis, some 100 km from Rio de Janeiro, Brazil, on January 18, 2011. (VANDERLEI ALMEIDA/AFP/Getty Images)

利斯附近被泥石流严重冲击的孤立区域鸟瞰图，离里约热内卢100公里处，巴西，20110118 (VANDERLEI ALMEIDA/AFP/Getty Images)

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Rio de Janeiro, Brazil: People take an evening dip in Ipanema on the summer's hottest day so far, with temperatures at 41 degrees celsius

里约热内卢，巴西：摄氏41度的高温，至今为止夏季最热的一天，人们享受伊帕内玛海滩的清凉晚浴 摄影: Marcelo Sayao/美国环保署

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Swan set out to change that. Invited to speak to world leaders at the first Earth Summit in Rio de Janeiro,Brazil, in 1992 he outlined a plan.

VOA: standard.2009.12.10

It will be held at the Pontifical Catholic University (PUC-Rio), in Rio de Janeiro, Brazil.

UNESCO: Indigenous Peoples

In 1992, he led the U.S. Senate's delegation to the Earth Summit in Rio de Janeiro, Brazil.

CNN: Vital Stats

In 1992, the world's largest environmental summit opened in Rio De Janeiro, Brazil, with 178 nations taking part.

CNN: Tuesday,