Nature is indifferent to the survival of the human species, including Americans.

Adlai Stevenson (1900-1965) American diplomat, statesman

Speech (1952-09-29), “Fireside Chat” (radio and television broadcast)
    (Source)

Reported in the Washington Evening Star (1952-09-30). Also reported in TIME Magazine, "National Affairs: Stevenson on Communism" (1952-10-13)