Question

what major factors play a role in global warming?
○ decrease in human activity and natural factors
○ natural factors and normal climate conditions
○ natural factors and human activity
○ decrease in human activity and normal climate conditions

Explanation:

Global warming is influenced by both natural factors (like volcanic eruptions, solar variations) and human activities (like burning fossil fuels, deforestation). The option "natural factors and human activity" aligns with this understanding. Other options have inconsistencies (e.g., "decrease in human activity" is incorrect as human activity is increasing, and "normal climate conditions" is not a factor causing warming).

Answer:

natural factors and human activity