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"label": "不负责任的赌博行为。确实，19世纪的国家也玩过民族主义的游戏，且",
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"label": "当时并未摧毁人类文明。然而，那是在广岛原子弹爆炸之前的时代。在",
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"label": "那之后，核武器提高了赌注的代价，也改变了战争和政治的基本性质。",
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"label": "只要人类知道如何浓缩铀和钚，人类的生存就有赖于将“预防核战争”",
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"label": "看得比任何特定国家的利益更为重要。那些激动地高喊“本国优先”的",
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"label": "民族主义者应该自问：“如果没有强有力的国际合作体制，只靠自己这个",
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"label": "国家，是否真有能力保护世界甚至保护自己免遭核毁灭?”",
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"label": "生态挑战",
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"label": "除了核战争，人类在未来几十年还会面临一种新的生存威胁，这几",
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"label": "乎是1964年的政治界无须考虑的：生态崩溃。人类在许多方面都正在破",
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"label": "坏全球生物圈的稳定，不断地从环境中夺取越来越多的资源，排放大量",
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"label": "的垃圾和有毒物质，并由此改变了土壤、水和大气的成分。",
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"label": "地球微妙的生态平衡是经过几百万年才形成的，但是人类目前正对",
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"label": "它造成破坏，而且几乎毫不自知。例如，使用磷肥。少量的磷是植物生",
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"label": "长的必需养分，但一旦过量便会产生毒性。现代工业化农业的基础，就",
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"label": "是人工在土地上施用大量的磷。过量的磷随降水或灌溉流走之后，就会",
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"label": "污染河流、湖泊和海洋，对海洋生物造成危害。于是，在艾奥瓦州种植",
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"label": "玉米的农民可能无意中杀死了墨西哥湾的鱼类。",
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"label": "这些人类活动造成栖息地退化、动植物灭绝，澳大利亚大堡礁和亚",
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"label": "马孙热带雨林等生态系统也可能被毁灭。几千年来，智人就像生态的连",
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"label": "环杀手，现在更逐渐成为大规模的生态屠夫。如果现在的情况继续下去，",
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"label": "不仅会造成大量的生物灭绝，还可能动摇人类文明的基础。",
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