Deadly piranha found in Thames, a river formerly declared biologically dead. Mind you, the killer fish was likely to have been (illegally) released by a private collector (or their vengeful ex-lover or young child who just saw Finding Nemo or something), rather than being a manifestation of global climate havoc:

Piranhas have taste buds which cover their bodies so that they can deduce whether any passing fish is worth eating. It doesn't bear thinking about what such sensitivity must have made of the polluted Thames.

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