警告信的签署者中有鲍勃·约翰逊，他是“生态足迹”概念的发起人，此概念衡量的是维持一个特定生活方式所需的环境投入总量。
Among the signatories of the warning was Bob Johnson, the originator of the "ecological footprint" concept, which measures the total amount of environmental input needed to maintain a given lifestyle.
总而言之，我们需要限制自然资源的过度使用，保护我们的生存环境，以便维持生态环境的平衡。
In conclusion, we should limit the overuse of the natural resources and protect our living environment in order to maintain the balance of environment.
总而言之，我们需要限制自然资源的过度使用，保护我们的生存鍏环境，以便维持生态环境的平衡。
In conclusion, we should limit the overuse of the natural resources and protect our living environment in order to maintain the balance of environment.
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