Research Outline

US & Global CO2 Emissions


To obtain the annual US and global CO2 emissions from passenger trips in cars, ubers, motorcycle, and other gas-based passenger trips, not including trucks or cargo shipping.
To determine how much CO2 can be removed from the atmosphere by converting majority of trips to electric alternatives.

Early Findings


  • In the US, a passenger vehicle's carbondioxide emissions are approximately 4.6 metric tons annually. The variation factors include fuel, fuel price, and the total miles driven.
  • The transportation sector contributes 29% of the GHG emissions in the US.
  • In 2018, the global GHGs rose by 2.1% despite all the global public commitments to keep the emissions on a low in order to reduce the global temperature.
  • China is the highest emitter of these gases, followed by the US, and the European Union.
  • China emits approximately twice as much as the US, as is shown in this graph.


  • CO2 makes up about 70% of the total aircraft exhaust. For each kilogram of fuel, 3.16 kilograms of CO2 is released into the atmosphere.
  • Although a half of these emissions is naturally removed from the atmosphere, it would sill take about 30 years, and 50% within 100 years, but the last 20% could stay in the atmosphere for thousands of years.

Uber and Lyft

  • Recent studies report that these two companies are contributing to CO2 pollution, undermining public transportation.
  • Increased traffic levels in major cities in the US has been caused by these ride-hailing companies. This has significantly reduced the use of public transport in these cities.
  • These surveys and reports were conducted by organizations such as the American Community Survey and the Massachusetts department of public utilities. These investigations covered major cities such as San Francisco, Boston, Los Angeles, New York, Philadelphia, Massachusetts, and Chicago.

Summary of our Early Findings

  • Our initial research was able to provide general insights into the global CO2 emissions as well as in the US.
  • Although our one-hour research time was not adequate to cover all the information, we were able to confirm that this is publicly and readily available.
Prepared By
Dagmawit W.
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