Answer :
The major environmental effects are as follows:
Hunter-gatherers:
- Over hunting species leads to extinction (especially species like giant sloths, giant bison, mastodons, cave bears, saber-toothed cats)
Agricultural Revolution:
- Flora and Fauna became domesticated
- Habitats were destroyed because the grasslands forests and wetlands were replaced by farmland that results in erosion and floods and made the soil less fertile
Industrial revolution
- Artificial substances replaced raw animals and plant products (plastics, pesticides)
- The rate of pollution increased.