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As global climate change becomes more urgent, carbon dioxide (CO₂) emissions are a key indicator in assessing the effectiveness of the world's energy transition. These emissions are mainly sourced from the energy sector in major countries such as China, the United States and a group of other countries. The research analyzes CO₂ emission trends by sec-tor, including Power, Industry, Ground Transport, and Residential to identify priority sectors that contribute significantly to total emissions. Using international data and a quantitative approach through linear regression and ANOVA, results show that the In-dustry, Power, and Ground Transport sectors experienced significant increases in emis-sions, while the Residential sector remained relatively stable. Significant differences be-tween sectors emphasize the need for specific and focused policy interventions. Geo-graphically, China is the largest contributor to emissions, while some countries such as Brazil and the UK show a decrease in emissions in the Power sector, reflecting the early success of the energy transition. The research offers a new approach by analyzing CO₂ emissions sectorally and spatially, providing a scientific basis for more equitable and effi-cient emissions reduction policies. The findings confirm the importance of international collaboration in achieving carbon neutrality targets in a sustainable way.