If you are not a biologist, you probably do not think about disappearing biological species often. But you should. Because due to objective laws of Nature, different ecosystems and Biosphere in general can only exist and function (i.e. support your life) with enough of Biodiversity (= interrelated biological species). If too many organisms extinct, everything starts falling apart. 

Biodiversity (National Geographic)

Business and Biodiversity (IUCN)

Biodiversity Problems