The 25-year deadline spells doom for many ocean species. One supermarket’s pledge to ban plastics puts the target to shame

The prime minister has declared war on plastic, with an announcement that the government hopes to “eliminate all avoidable plastic waste” within 25 years. You could say that this week saw the first troops landing on our plastic-strewn beaches. But, rather than our ministers or MPs, they turned out to be the shelf-stackers and checkout workers of Iceland supermarkets.

Those...