It has been predicted that the Swallowtail, Britain's largest butterfly, will disappear from these islands in the next 40 years (https://www.theguardian.com/environment/2018/jun/29/sea-level-rise-could-wipe-out-swallowtail-butterfly-in-40-years). The butterfly is mainly found in the fens of Norfolk and Cambridgeshire where its larva feeds only on Milk parsley. The problem is that this food plant has no salt tolerance and the predicted raising of the sea-level in the near future will convert the fens into saltmarsh. No food plant: no butterfly.
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