关于化石燃料的讨论常常缺乏细微差别——我们必须承认它们的历史作用和超越它们的紧迫性。

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.