This fork of the HTML Starter visualizes 156 months of synthetic climate data from 2010 to 2022, combining three variables in a single SVG chart. It shows rainfall as skyblue bars against the left axis, while temperature and CO₂ appear as tomato and green lines against the right axis. The code uses d3.scaleTime, d3.scaleLinear, d3.axisBottom, d3.axisLeft, d3.axisRight, and d3.line to render the axes and paths. Data are generated in-browser with Math.sin, Math.cos, and Math.random.