burning a forest burning fossil fuels digging a new landfill spraying crops with chemicals
I gave my students this multiple choice question: Human actions affect the environment. Which human action affects the smallest area of the environment?

Only one answer is correct among these 4 choices:
- burning a forest
- burning fossil fuels
- digging a new landfill
- spraying crops with chemicals

Could you tell me which one is correct?

digging a new landfill