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    by Lieber, Kier A, Press, Daryl G
    Published 2013
    ... conflict is arguably the most important deterrence challenge facing the United States in the 21st century...
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  4. 584
    ...-1 by the end of the 21st century. This surface mass balance increase is largely due to precipitation...
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    ... changes in soil temperature, moisture, and air temperature predicted over the 21st century from 14 Earth...
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    by Frantz, T. C.
    Published 2005
    ... Components of the Army and the Air Force. The 21st Century threat presents unique challenges to America...
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