German discount supermarket Lidl is seeking to boost its environmental credentials by announcing it is taking steps to buy all its bananas from 100% sustainable sources this year.

It is switching by the end of 2016 to taking supplies only from farms that are either Rainforest Alliance – or Fairtrade Foundation certified.

Last year, sales of Fairtrade goods fell for the first time since the ethical trading scheme was founded 20 years ago as cash-strapped consumers tightened their belts, spending more at discount retailers such as Lidl and Aldi. Both stores have to date sold a limited range of Fairtrade products, but are under pressure to give the public wider choice.

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