Marks & Spencer and Waitrose top list for helping customers buy " sustainable fish", but many other products carry baffling green labels
Supermarket giant to replace tomato tins with cartons in effort to cut packaging and emissions
Agreement is seen as a major step towards achieving the retailer’s environmental objectives
WWF hopes deal will encourage more retailers to shun non-certified palm oil
The development of PAS 2060 is being supported by organisations including Marks & Spencer and Eurostar