Your essay must have a title, an introduction, and a conclusion. Make sure to define your terms and provide appropriate background information. A possible essay structure contains six paragraphs: a first paragraph that briefly introduces the argument you will make in the essay; a second paragraph describing how total CO2 has changed over time and explaining how well it is correlated with total GDP; a third paragraph describing how per-capita CO2 has changed over time and explaining how well it is correlated with per-capita GDP; . a fourth paragraph describing how energy intensity has changed over time; a fifth paragraph describing how PM2.5 has changed over time, and explaining why Greenstone et al. consider it to be detrimental to health; and a sixth, concluding, paragraph that briefly describes the main points you have made in the essay. The maximum length is 500 words plus a two-page data appendix; include a word count at the end of your submission. Include the grading rubric as the first page of your submission. Use Chicago or APA style, and write in 11- or 12-point font, double-spaced, with one-inch margins. Provide a bibliography listing the references you use, including the class PowerPoints if relevant. You must submit a hard copy (in class) and an electronic copy (on Brightspace) by the deadline. Please note that the electronic copy will be submitted to anti-plagiarism software. Data Appendix: The data appendix should include enough detail for the grader to determine that you downloaded the correct data and performed the calculations accurately; if not all of your data fits on two pages, you may decide to include only the first and last years of information. Required charts and figures go into the body of your essay; any supplemental charts and figures should be placed in your data appendix