This example visualizes the environmental impact of different food types—cattle, pork, poultry, and mealworms—comparing land use, feed, water, and warming through a series of small marker blocks. The code uses d3.select and d3.scaleLinear to position elements, while a grid of thin rectangles represents data points. Using d3.v4 and d3.v6 loaded via script tags, the SVG rendering draws a black background with green land indicators, though the loop that creates the markers contains a conditional assignment bug, leaving the visualization incomplete. The data.csv file supplies the comparative values.