Because we humans burn fossils so fast the CO2 level in the Oceans rise Anemones become acid and Nemo has problems to locate predators.
According to numerous studies, if ocean acidification continues at the current rate, clownfish could experience significant sensory impairment. Since clownfish rely on their auditory and olfactory capabilities to evade predators and locate appropriate habitats, there is much indication that ocean acidification will negatively affect their population numbers. Signs appearing here! 6 years ago we had many more anemones and Nemos here!
PLEASE reduce your carbon footprint!