This visualization shows the change in global, Northern Hemisphere, and Southern Hemisphere temperatures from 1880 to 2014, with each time series as a separate line. A color legend identifies the three regions. Built with D3 v5, it loads CSV data and uses `d3.scaleTime` and `d3.scaleLinear` for axes, while `d3.line` with `curveBasis` generates the paths. The chart renders as SVG, with axes and line styling defined in CSS.