00455nam a22001337a 450000500170000000800410001702000180005804000130007608200190008910000190010824501350012726000480026230000110031020170913095126.0170913b        xxu||||| |||| 00| 0 eng d  a9780061137914  cPK-LaUMT  a577.276bWAR-U  aWard, Peter D.  aUnder a green sky :bglobal warming, the mass extinctions of the past, and what they can tell us about our future /cPeter D. Ward  aNew York :bHarperCollins Publishers,c2007  a242 p.