Climate change is one of the most pressing global challenges of the 21st century, with carbon dioxide (CO2) emissions identified as the primary driver of global warming. Understanding what factors drive national-level emissions is critical for designing effective climate policy. Countries differ substantially in their per-capita emissions, and these differences are shaped by economic scale, energy systems, and fossil fuel dependence. This project analyses the Our World in Data (OWID) CO2 and Greenhouse Gas Emissions dataset to investigate the structural factors that explain variation in CO2 emissions per capita across countries from 1990 to 2024. We apply regression to quantify the relationship between emissions and their key drivers, and classification to group countries into low, medium, and high emission intensity categories.