The plastic tags, like those on supermarket groceries, have been nailed to a million trees across Africa, southeast Asia and South America to help countries keep track of timber reserves.

• 这种塑料的条形码，如同超市货物架上商品的条形码一样，已经被钉在了非洲、东南亚、南美洲的数百万棵树上，以帮助政府机构查询市场上销售木材的出处。