【正确答案】 D

【答案解析】[试题分析] 这是一道事实分析题。
[详细解答] 由文章第四段“This is the first time that we have been asked to defend ourselves and what we hold dear in cooperation with all the other inhabitants of this planet who share with us the same endangered air and the same endangered oceans．”可知我们的合作者是生活在地球上的所有人。所以答案D是正确的。