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Our materials are protected by copyright, but you can use information you get from our web sites for free for any non-commercial purpose, as long as you include the copyright notice below and list the address of or link to the page where the material is found.

Legalese version: Environmental Defense Fund hereby grants a non-exclusive license to any person to copy and use individual pages or portions our web sites for non-commercial purposes, and to any member of the media for media purposes, on the condition that the appropriate copyright notice is displayed.

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Copyright © 2024 Environmental Defense Fund. Used by permission. The original material is available at http://edf.org.