【句子展示】
But science does provide us with the best available guide to the future, and it is critical that our nation and the world base important policies on the best judgments that science can provide concerning the future consequences of present actions.
【句子分析】
单词短语：
critical：至关重要的
concerning：相关的
句式结构：
But science does provide us with the best available guide to the future, and it is critical that our nation and the world base important policies on the best judgments（主语从句）that science can provide（定语从句）concerning the future consequences of present actions（定语）.
参考译文：
但科学确实为我们提供了关于未来的最好的可行性指导，我们国家和整个世界在做重要决策时，应该以科学能够提供的关于人类当前行为对未来影响的最佳判断为依据，这一点至关重要。
