Which country did not agree to sign the Kyoto Protocol and, as of 2005, was the largest emitter per capita of gases believed to cause global warming?

• A. India
• B. United States of America
• C. Russia
• D. Australia

Answer: (D)

The idea here is to connect two ideas: what a country signs in an international treaty, and how much each person in that country contributes to greenhouse gas emissions. The Kyoto Protocol created binding targets for developed nations, but signing and ratifying are not the same thing, and not every major emitter joined in a way that bound them to targets by 2005. Per-capita emissions look at the average footprint of each person in a country, and those numbers tend to be highest in places with energy-intensive economies and heavy coal use. Among the options, the country that stands out as having a very high per-capita emissions level in that period is Australia, driven by its energy mix and consumption patterns. This helps explain why it’s the choice associated with the two parts of the question: relatively high per-capita emissions and a stance that did not align with Kyoto participation as of 2005. The other countries either had lower per-capita footprints or different levels of involvement with Kyoto by that time.