Skip Navigation

Button that takes you back to the home page. Button that takes you to the teacher pages. Button that takes you to the modules and activities page. Button that takes you to the glossary page. Button that takes you to the related links page. Button that takes you to the references page. Button that takes you to the Problem Based Learning model page. Image map of some Global Climate Change puzzle pieces.  Please have someone assist you with this.

Button that takes you to the Overview page.
Button that takes you to the Human Influences page. Button that takes you to The Chemistry page. Button that takes you to the Troposheric Ozone page. Button that takes you to the Atmospheric Nitrous Oxide page. Button that takes you to the Atmospheric Methane page. Image that says Atmospheric CFCs.
Button that takes you to the Impacts page.

Go to the "Carbon Dioxide" puzzle piece for more information about Human Influences on this gas.

Image of Earth System Science Education Alliance logo that links to the Earth System Science page.

 

Image of Earth's Spheres logo that links to the Earth's Spheres page.

 

Global Climate Change: Human Influences-- Atmospheric CFCs
Atmospheric concentrations of chlorofluorocarbons (CFCs), anthropogenic aerosol compounds containing chlorine, fluorine, and carbon, have increased dramatically in recent decades. These compounds, also known as freons, were commonly used in propellants, refrigerants, and solvents. In 1989, after discovering the environmental impacts of CFCs, the leaders of 13 nations agreed to stop producing them by the year 2000. It will take some time, however, for the CFCs already in the atmosphere to be broken down. Figure: The concentration of chlorofluorocarbons in the atmosphere from 1977 to 1994.

Image of a graph showing the concentration of chlorofluorocarbons in the atmosphere from 1977 to 1994.

 

Overview ..|.. Human Influences ..|.. Impacts
Atmospheric CFCs / Atmospheric Methane / Atmospheric Nitrous Oxide / Tropospheric Ozone / The Chemistry
Glossary ..|.. Related Links ..|.. References  |.. PBL Model

Home ..|.. Teacher Pages ..|.. Modules & Activities

Button that takes you back to the Global Climate Change main page.

HTML code by Chris Kreger
Maintained by ETE Team
Last updated November 10, 2004

Some images 2004 www.clipart.com

Privacy Statement and Copyright 1997-2004 by Wheeling Jesuit University/NASA-supported Classroom of the Future. All rights reserved.

Center for Educational Technologies, Circuit Board/Apple graphic logo, and COTF Classroom of the Future logo are registered trademarks of Wheeling Jesuit University.