55% sureLots of sources credit Rachel Carson with this, and they agree with each other. The book or the speech it first came from hasn't turned up yet.
What turned up
Personal letter, circa 1957 (dated by the citing source, likely collected in Always, Rachel: The Letters of Rachel Carson and Dorothy Freeman). Quoted verbatim by a literary essay that dates the letter; not independently confirmed, so held at likely.
Work
personal letter to Dorothy Freeman
Occasion
1957 · private correspondence, quoted in a literary essay
Sources checked
themarginalian.orgChecked using claude-sonnet-5, 21 August 2026quotes a dated Carson letter, circa 1957
Nothing made from these words yet — is where they get made.