Science

Europe, to its credit, has acted on some of the science. Paraquat — the herbicide chemically similar to MPTP — was finally banned in 2007, although only after Sweden took the European Commission to court for ignoring the evidence of its neurotoxicity. Other pesticides with known links to Parkinson’s, such as rotenone and maneb, are no longer approved.

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Among the chemicals still in use, none has drawn more scrutiny — or survived more court battles — than glyphosate.