Project Description: Global CO₂ Emissions Comparison (1990–2020) This data science project visualizes and compares the carbon dioxide (CO 2 ​ ) emissions of three major global economies—India, the United States, and China—across four distinct milestone decades (1990, 2000, 2010, and 2020). Using a side-by-side bar chart built with R and ggplot2, the analysis highlights the dramatically shifting landscapes of industrial growth and environmental impact among these nations over a 30-year period.