In a report just released, the National Academy of Sciences takes America to task for being the world’s biggest contributor of the plastic refuse that finds its way into to the oceans. But the claim needs closer examination. Credible prior reporting has estimated, on a country-by-country basis, the seaward flux of packaging materials: plastic bottles, bags, eating and drinking utensils, and sundry other consumer items afloat on ocean currents. Study outcomes may vary and yield somewhat divergent results, accountable from differing methodologies reliant on the modeling assumptions used, but their overall agreement is consistent. Neither cited study supports NAS’s contention...