This interactive shows how much the prices of various fossil fuels would change under different levels of carbon taxes. For more information on the calculations, please see the blog post introducing the tool by Marc Hafstead at Resources for the Future.
The graphs are made using D3 v4. The data are pulled via the Google Sheets API so that content editors can easily change the text and numbers if need be without having to get into the code. The dev environment is ES6 JavaScript linted by jshint and compiled by Babel (via Grunt, with help from Browserify).
Work for hire. Copyright is held by Resources for the Future (more).