Humans can cause extinction of a species through pollution, habitat destruction, the introduction of new species, such as new predators and species that might compete for food, over hunting, and other complications. to the environment.
65 Million years ago the last of the dinosaurs where slowly disappearing, but not all the dinosaurs were extinct some reptiles like cockroaches and alligators have evolved and adapted to the new environment on earth.
Future of mankind will completely depend on what people will teach there children about Extinction, and hopefully it will be lot better when they are adults than it is today.