An interactive bar chart displays the growth rate change in U.S. energy sources from 2012 to 2021, with buttons to toggle between Solar and Gas datasets. The visualization shows outlined, red-stroked bars in an SVG, where each bar’s height represents the annual emission growth value. Using D3 v4, the code implements `d3.scaleBand()` for the x-axis, `d3.scaleLinear()` for the y-axis, and transitions that animate axis updates over 2.5 seconds. A tooltip appears on mouseover, and the chart title and axis labels update dynamically based on the selected energy source.