This interactive horizontal tree graph visualizes climate data, grouping records by city and then by timestamp. The final leaf for each city reveals its last recorded metrics—temperature, wind direction, humidity, and carbon emission—as distinct child nodes. D3.js fetches the dataset from a remote CSV file and transforms it into a hierarchical structure. The graph uses `d3.tree()` and `d3.hierarchy()` for layout, and renders nodes and connecting links as SVG paths with `d3.linkHorizontal()`. The interface presents a clear, top-down breakdown of environmental measurements across locations.