This D3.js visualization displays three climate change metrics—CO₂ levels, temperature anomaly, and global mean sea level—as multi-line trends over time, using red, blue, and green strokes to distinguish each series. It employs dual y-axes, with temperature and sea level sharing a left scale while CO₂ uses a right scale, rendered via `d3.line` path generators. The SVG output loads data from a remote CSV using `d3.csv`, converts numeric fields with unary plus operators, and applies `d3.scaleLinear` domains and `d3.axisBottom`/`d3.axisLeft`/`d3.axisRight` for tick marks. Axes are formatted with integer tick labels, and lines are drawn with a 2-pixel stroke width.