6月5日，参加2005年联合国世界环境日纪念活动的与会代表在美国旧金山共同签署了《绿色城市宣言》和《城市环境协定》。据悉，今年世界环境日的纪念活动首次在美国举行，主题是“营造绿色城市，呵护地球家园”。外电报道如下：Big city mayors from around the world signed a series of pacts¹ on Sunday to improve the conditions of urban centers, capping a five-day U.N. World Environment conference in San Francisco, the city where the United Nations was founded in 1945.

The signing ceremony on World Environment Day in the ornate rotunda² at City Hall committed more than 50 of the world's largest cities to "build an ecologically sustainable, economically dynamic, and socially equitable³ future for our urban citizens," organizers said.

The accords call for 21 actions aimed at putting cities on a path to greener, cleaner, healthier environments for their current residents and the estimated 1 million people moving to cities each week.

Rotunda表示“圆形建筑物，圆形大厅，圆角黑体铅字”，例如：The Capitol at Washington has a large rotunda.（华盛顿的国会大厦有一个圆形大厅。）

据悉，《绿色城市宣言》呼吁世界各城市积极参与和执行《城市环境协定》中的21项行动计划，通过立法程序将环境问题纳入重要的发展日程，从而有效控制污染，加强城市绿化