overpopulation
🇺🇸
/ˌəʊvərˌpɑːpjuˈleɪʃn/
🇬🇧
/ˌəʊvəˌpɒpjuˈleɪʃn/
When there are too many people living in a place, like a city or a country.
Overpopulation can lead to problems like traffic and pollution.