The table compares the average annual CO₂ emissions per capita across five countries — the United States, Australia, Germany, China, and India — over three decades from 1990 to 2020. Overall, the most striking feature is that the United States and Australia consistently recorded the highest emissions throughout the period, while India remained the lowest. The United States peaked at approximately 20 tonnes per person in 1990 and declined slightly to around 15 tonnes by 2020, suggesting gradual efficiency improvements. China, by contrast, showed a dramatic rise — more than tripling from roughly 2 to 7 tonnes over the same period, reflecting rapid industrialisation. In conclusion, while developed nations are reducing emissions, emerging economies are growing significantly, underlining the global challenge of carbon reduction.