China ships roughly 78 million pounds of a Parkinson’s-linked herbicide to American ports every year, a chemical Beijing has banned within its own borders. Now Congress is moving to shut that pipeline down for good. The bipartisan Paraquat Prevention Act, authored by Rep. Anna Paulina Luna (R-FL) would cancel all legal use of the herbicide paraquat in the United States. The chemical has been tied to devastating neurological damage and is already…