This line chart shows the relationship between population and electricity consumption across major global cities, with each point representing a city and a smooth curve connecting them by ascending population. The visualization uses D3 v7 with SVG rendering and includes interactive hover tooltips displaying detailed city statistics. Data is loaded from a remote text file, parsed in-browser using `d3.csvParse`, then sorted and scaled with `d3.scaleLinear`. The chart applies `d3.axisBottom` and `d3.axisLeft` for axes, `d3.line` with `curveMonotoneX` for the path, and gridlines generated from the axis scales.