Burning just one gallon of gasoline creates 20 pounds of greenhouse gases â€” the leading contributor to climate change. According to the Environmental Protection Agency, highway vehicles emit 1.7 billion tons of greenhouse gases like CO_{2} each year, close to one-quarter or all greenhouse gas emitted in the United States each year.

Unlike other pollutants, CO_{2} cannot be filtered with technologies like the catalytic converter. The only way to reduce CO_{2} emissions is by burning less or different fuel. The vehicle an American chooses to drive is the largest factor in his or her contribution to climate change, according to the EPA.

24/7 Wall St. reviewed data obtained from the EPAâ€™s 2017 Fuel Economy Guide. The least eco-friendly car is the special off-road model of the Mercedes-Benz G 550 4Ă—4, which emits on average 829 grams of CO_{2} per mile.

**Click here to see Americaâ€™s Least Eco-Friendly Vehicles.**

Many of the least eco-friendly vehicles are high performance sports cars that are not intended for daily driving. However, because fuel is burned so quickly in many of these cars, even rare driving can release significant amounts of greenhouse gasses.

A Lamborghini Aventador creates almost five times as much CO_{2} per mile as the Hyundai Ioniq Blue â€” one of the most fuel efficient gasoline-only vehicles on the market. This is assuming the Lamborghini is never driven aggressively, which lowers the fuel efficiency of any car considerably.

After sports cars, SUVs and luxury vehicles dominate this list. Similar to high performance sports cars, these heavy SUVs and luxury vehicles tend to have very large engines, which in general consume more fuel.

A 2017 Toyota Sequoia 4WD FFV, for instance, averages only 14 miles per gallon and emits 632 grams of CO_{2} for every mile driven. Driven daily, a single Sequoia would release as much CO_{2} as four gasoline-powered Toyota Priuses each year.

To determine the least environmentally-friendly vehicles available in the United States, 24/7 Wall St. reviewed CO_{2} emissions per mile driven for over 1,200 vehicles with data from the Environmental Protection Agencyâ€™s 2017 Fuel Economy Guide datafile. To break ties between vehicles with equal CO_{2} emissions, we used fuel efficiency figures followed by annual fuel cost from the same dataset. We only considered the least environmentally-friendly vehicle within each model. For example, because the Maserati Granturismo Convertible releases more CO_{2} per mile than the Maserati Granturismo Coupe, the Convertible was selected for the ranking.

These are Americaâ€™s least eco-friendly vehicles.

** 50. Lamborghini Huracan**

**> CO _{2} released per mile:** 532 grams

**> Fuel efficiency:**17 mpg

**> Annual fuel cost:**$2,450

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**49. Aston Martin Rapide S**

**> CO _{2} released per mile:** 533 grams

**> Fuel efficiency:**17 mpg

**> Annual fuel cost:**$2,450

**48. Chevrolet Corvette**

**> CO _{2} released per mile:** 540 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**47. Chevrolet SS**

**> CO _{2} released per mile:** 544 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**46. Dodge Charger SRT**

**> CO _{2} released per mile:** 546 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**45. Lamborghini Huracan Spyder**

**> CO _{2} released per mile:** 547 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**44. Ford Shelby GT350 Mustang**

**> CO _{2} released per mile:** 549 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**43. BMW X6 M**

**> CO _{2} released per mile:** 549 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**42. BMW X5 M**

**> CO _{2} released per mile:** 549 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**41. GMC K1500 Yukon XL 4WD**

**> CO _{2} released per mile:** 553 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,300

**40. BMW M6 Convertible**

**> CO _{2} released per mile:** 553 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**39. Nissan Armada 2WD**

**> CO _{2} released per mile:** 555 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,300

**38. Ford F150 5.0L 2WD FFV GVWR>7599 LBS**

**> CO _{2} released per mile:** 555 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,300

**37. Aston Martin Vanquish, S and Zagato**

**> CO _{2} released per mile:** 555 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**36. Roush Roush Stage 3 Mustang**

**> CO _{2} released per mile:** 559 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**35. Mercedes-Benz Maybach S 600**

**> CO _{2} released per mile:** 565 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**34. Dodge Challenger SRT**

**> CO _{2} released per mile:** 567 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**33. Ford Transit T150 Wagon FFV**

**> CO _{2} released per mile:** 570 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,300

**32. Land Rover Range Rover**

**> CO _{2} released per mile:** 570 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

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**31. BMW M760i xDrive**

**> CO _{2} released per mile:** 571 grams

**> Fuel efficiency:**16 mpg

**> Annual fuel cost:**$2,600

**30. Maserati Granturismo Convertible**

**> CO _{2} released per mile:** 577 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**29. RAM 1500 4X4**

**> CO _{2} released per mile:** 580 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,650

**28. Nissan Armada 4WD**

**> CO _{2} released per mile:** 588 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,450

**27. Chevrolet Camaro**

**> CO _{2} released per mile:** 591 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**26. Jeep Grand Cherokee SRT 4Ă—4**

**> CO _{2} released per mile:** 592 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

**25. Infiniti QX80 4WD**

**> CO _{2} released per mile:** 593 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**24. Toyota Land Cruiser Wagon 4WD**

**> CO _{2} released per mile:** 595 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,450

**23. Lexus LX 570**

**> CO _{2} released per mile:** 596 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

**22. Bentley Bentayga**

**> CO _{2} released per mile:** 596 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**21. Rolls-Royce Wraith**

**> CO _{2} released per mile:** 604 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

**20. Bentley Flying Spur**

**> CO _{2} released per mile:** 604 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**19. Bentley Continental GT Convertible**

**> CO _{2} released per mile:** 604 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

**18. Toyota Tundra 4WD**

**> CO _{2} released per mile:** 606 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,450

**17. Mercedes-Benz AMG GLE 63**

**> CO _{2} released per mile:** 611 grams

**> Fuel efficiency:**15 mpg

**> Annual fuel cost:**$2,800

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**16. Mercedes-Benz AMG GLS 63**

**> CO _{2} released per mile:** 615 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

**15. Dodge Viper**

**> CO _{2} released per mile:** 623 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

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**14. Rolls-Royce Ghost**

**> CO _{2} released per mile:** 627 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

**13. Rolls-Royce Dawn**

**> CO _{2} released per mile:** 627 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

**12. Toyota Sequoia 4WD FFV**

**> CO _{2} released per mile:** 632 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$2,600

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**11. Rolls-Royce Phantom Coupe**

**> CO _{2} released per mile:** 638 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

**10. Ford Ford GT**

**> CO _{2} released per mile:** 654 grams

**> Fuel efficiency:**14 mpg

**> Annual fuel cost:**$3,000

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**9. Ferrari F12 Berlinetta**

**> CO _{2} released per mile:** 672 grams

**> Fuel efficiency:**13 mpg

**> Annual fuel cost:**$3,250

**8. Ferrari GTC4Lusso**

**> CO _{2} released per mile:** 674 grams

**> Fuel efficiency:**13 mpg

**> Annual fuel cost:**$3,250

**7. Ferrari LaFerrari Aperta**

**> CO _{2} released per mile:** 682 grams

**> Fuel efficiency:**13 mpg

**> Annual fuel cost:**$3,250

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**6. Bentley Mulsanne EWB**

**> CO _{2} released per mile:** 692 grams

**> Fuel efficiency:**13 mpg

**> Annual fuel cost:**$3,250

**5. Ferrari F12 tdf**

**> CO _{2} released per mile:** 711 grams

**> Fuel efficiency:**12 mpg

**> Annual fuel cost:**$3,500

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**4. Chevrolet G3500 Express 2WD PASS MDPV**

**> CO _{2} released per mile:** 716 grams

**> Fuel efficiency:**12 mpg

**> Annual fuel cost:**$3,050

**3. Aston Martin V12 Vantage S**

**> CO _{2} released per mile:** 724 grams

**> Fuel efficiency:**12 mpg

**> Annual fuel cost:**$3,500

**2. Lamborghini Aventador Coupe LP740-4**

**> CO _{2} released per mile:** 746 grams

**> Fuel efficiency:**12 mpg

**> Annual fuel cost:**$3,500

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**1. Mercedes-Benz G 550 4Ă—4 (Special Off-Road Model)**

**> CO _{2} released per mile:** 829 grams

**> Fuel efficiency:**11 mpg

**> Annual fuel cost:**$3,800

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