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SW: added bear rocks
In addition, neither Rutledge nor Kharecha/Hansen analyzes scenarios that would limit carbon dioxide levels to 350 ppm, a level more recently suggested as a "safe" threshold by climate scientists.<ref>[http://www.columbia.edu/~jeh1/2008/TargetCO2_20080407.pdf "Target Atmospheric CO<sub>2</sub>: Where Should Humanity Aim?"], James Hansen et al, 2008</ref>
==Examples of coal placed off limits to mining by private or public conservation measures==
===Nature Conservancy===
* Dolly Sods Wilderness Area: ::In the 1970s The Nature Conservancy acquired 15,000 acres of coal rights and transferred them to the U.S. Forest Service, allowing for the creation of the 10,000 acre Dolly Sods Wilderness Area. In the early 1990s, the Conservancy acquired over 6000 acres (known as "Dolly Sods North") for the Forest Service. The Preserve was created in 2000 with the donation of 477 acres by Dominion, an energy company based in Virginia. The Conservancy also has 147 acres in conservation easements.<ref>[http://www.nature.org/wherewework/northamerica/states/westvirginia/preserves/art13865.html "Bear Rocks Preserve,"] Nature Conservancy website, accessed 10/08</ref>
