Environmental pollution. This is the most direct and obvious disadvantage.

Species extinction is accelerating, which is caused by environmental pollution and human hunting, and also belongs to the disadvantages of scientific and technological development.

Personal safety is becoming more and more insecure. Now tens of thousands of crimes occur every day on average, and their criminal methods are related to the new technology in Otawa. Especially gun-related crimes, so that ordinary people can't prevent it. From the Second World War, we can already see that with the development of science and technology, the damage and losses caused by the current war are far from comparable. It may even lead to the fate of human extinction.

With the development of science and technology, the emergence of vehicles such as air cars, trains and planes has greatly changed human daily life. Human beings are no longer always dependent on their own legs, so the physical quality of human beings can't be compared with before. It is impossible for Xiang Yu to "pull out the mountains and rivers" in today's society. If this situation continues to develop, it may make people's limbs atrophy and a new one appear.

All kinds of emerging germs appear constantly, and the lethality of many germs has far exceeded the destructive power of previous germs. This is because the rapid development of medical science and technology has accelerated the mutation of virus, so that the development speed of science and technology can not keep up with the mutation speed of virus. Maybe one day mankind will die of a great plague.