00421cam a22001457a 4500008004000000020001800040082001300058100001700071245007100088260003400159300001000193650002800203650002400231700002000255180718b2011   xxu||||| |||| 00| 0 eng d  a9788120343689  aO91 B45e  aBerck, Peter  aThe economics of the enviromentcby Peter Berck and Gloria Helfand  aNew DelhibPHI Learningc2011  a508p.  aSustainable development  aEnvironment -Policy  aHelfand, Gloria