This interactive choropleth visualizes global CO2 emissions per country from 1850 to 2023, with a draggable year slider and a green-to-red gradient legend. Users can hover over countries to view precise emission values in a tooltip, and click the legend to filter countries by specific emission ranges. Built with React and D3.js, it uses `geoNaturalEarth1` projection, `geoPath`, and `sliderBottom` to render the map and controls. The visualization loads historical data from a CSV file and allows switching between emissions, population, and GDP metrics.