Question

what is the primary reason for the recent increase in global temperatures? volcanic activity natural climate variability solar radiation changes increased greenhouse gas levels

Explanation:

Human - activities like burning fossil fuels have led to a significant increase in greenhouse gas levels such as carbon - dioxide. These gases trap heat in the Earth's atmosphere, causing global warming. Volcanic activity can have a cooling effect in the short - term, natural climate variability is not the main driver of recent rapid warming, and solar radiation changes have not been the primary cause of recent global temperature increases.

Answer:

Increased greenhouse gas levels