These fuels, which are burned to run automobiles, heat buildings, and power factories are responsible for about 98% of U.S. carbon dioxide emissions, 24% of methane emissions, and 18% of nitrous oxide emissions. ...

• Word Count: 640
• Approx Pages: 3
• Grade Level: High School

The emission targets cover the 3 major greenhouse gases: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N20), plus hydrofluorocarbons (HFCs), perflurocarbons (PFCs) and sulfur hexafluoride (SF6). ...

• Word Count: 842
• Approx Pages: 3
• Grade Level: Undergraduate