Sainsbury were rated the best of the 'big four'
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Supermarkets have been given scores according to their environmental policies.
The National Consumer Council looked at five categories: waste, how far food has been transported, the sustainability of fish and of wood products and sustainable farming.
Each company was graded between A and E for each area and then given an overall mark based on its average score.
Waitrose, awarded a 'B', did best overall, with Sainsbury and M&S gaining a 'C' grade.
At the other end, Morrisons and Somerfield was given a ticking-off, with an 'E'.
Watch Rob's full report...
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