After reading Chapters 5 and 6 of Clearing the Air, please discuss your thoughts

After reading Chapters 5 and 6 of Clearing the Air, please discuss your thoughts on finding the balance between reduced CO2 emissions and pollutants such as NOx and PMs. What technologies do you think we should be improving, not just for individual vehicles, but also for major transportation/shipping industries. What options do you believe are sustainable? In grading, I look for thoughtful and unique answers. If you state an opinion or fact, please back it up. You are also graded on driving the discussion and participating with others. Rubric for grading discussions:
Interacts with other participant’s posts – 2.5 points
Complete sentences – 2.5 points
Answers the questions – 2.5 points
Comments drive discussion/are comprehensive – 2.5 points
Total – 10 points