地球暖化問題，令很多豆波灰蝶從非洲及歐洲南部往北遷徙到英國南部，灰蝶雖然能找到合適的植物產卵繁殖，但保育團體憂慮牠們未必能成功渡過英國嚴寒的冬天。

Many long-tailed blues butterfly migrated to southern England from African and Southern Europe because of global warming. The long-tailed blues are able to find suitable plants to lay their eggs in England, but environmentalists worry British winters are too cold for them and they might not survive

https://www.theguardian.com/environment/2019/aug/28/global-heating-brings-mediterranean-butterfly-to-uk