Environmental Science 14th Edition by Tyler Miller ,Scott Spoolman

تمرين 15

In 2008. the average fuel economy of new cars, light trucks, and SUVs in the United States was 11.4 kilometers per liter (kpl). or 26.6 miles per gallon (mpg), and the average motor vehicle in the United States was driven 19.300 kilometers (12.000 miles). There were about 250 million motor vehicles in the United States in 2008. The U.S. Environmental Protection Agency estimates that 2.3 kilograms ol CO ₂ are released when 1 liter of gasoline is burned (19.4 pounds of CO ₂ are released when 1 gallon is burned). Use these data to calculate the gasoline consumption and carbon footprints of individual motor vehicles with different fuel efficiencies and for all of the motor vehicles in the United States by answering the following questions:
If the average fuel efficiency of the U.S. fleet increased from 8.5 kpl (20 mpg) to 19.6 kpl (46 mpg), by what percentage would this reduce the CO ₂ emissions from the entire fleet per year You can think of this as the percentage reduction in the carbon footprint of the U.S. motor vehicle fleet.