This stacked area chart visualizes global CO2 emissions over time, broken down by source type: solids, liquids, and gas. The chart uses d3.stack to layer the series and d3.area with a curveBasis interpolation to render the smooth areas. Labels are positioned using the d3-area-label plugin, and the color scale employs d3.schemeDark2. The visualization is interactive, with hover effects darkening each area, and includes axes with gridlines and a rotated y-axis title.