Research: IQ Scores Dropping Since the 1970s

Flynn effect and its reversal are both environmentally caused – Proceedings of the National Academy of Sciences (link to abstract – $ for full-text)

Commentaries: Researchers find IQ scores dropping since the 1970s – MedicalXpress (free) AND IQ Scores Are Falling in “Worrying” Reversal of 20th Century Intelligence Boom – Science Alert (free) AND IQ Scores Are Falling Due to Environmental Factors, Study Finds – TIME (free)