This interactive choropleth map visualizes historical CO2 emissions, population, and GDP for countries from 1850 to 2023, with a color gradient from green to red indicating value magnitude. Users can hover over countries to view specific data, adjust the year via a slider or scroll wheel, and switch between displayed parameters. The visualization uses React with D3 libraries including `geoNaturalEarth1` for projection, `geoPath` for map rendering, `sliderBottom` for the year control, and `interpolateRgb` for color scaling. Data comes from the Our World in Data CO2 dataset, loaded from a CSV file.