Earth's Atmosphere

Page
3

U.S. N2O Emission Sources

Source: U.S. EPA

100-year GWP = 31 0

Slide 15

Fluorinated Gases

Hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. These gases are typically emitted in smaller quantities, but they are potent greenhouse gases.

U.S. Fluorinated Gas Emission Sources

Source: U.S. EPA

100-year GWP HFCs: 140-11,700 PFCs: 6,500-9,200

SF6: 23,900

Slide 16

Changes in Atmospheric Levels of Greenhouse Gases

Source: U.S. EPA

Slide 17

Ocean Acidity

Source: U.S. EPA

Ocean carbon dioxide levels have risen in response to increased carbon dioxide in the atmosphere, leading to an increase in acidity (that is, a decrease in pH).