This example visualizes temperature readings over time as a smooth line chart, with a time-based x-axis and linear temperature y-axis. The chart uses React components with D3 v5 scales and the `line` and `curveNatural` generators to draw the curved path, while helper components render axes with tick marks and labels. The data originates from the Data Canvas Sense Your City Dataset, though the active dataset loads world country topologies via `d3.json` and `topojson.feature`, making the chart behavior partly exploratory. The SVG rendering includes styled axis lines, text, and a stroke-only path without visible data points.