Bearskin by James McLaughlin Ecco/Harper Collins, $26.99, 340 pages, ISBN 978-0-06-274279-7 There is a quiet, but ongoing—and growing—conflict in America, in which well-intentioned, ultra-wealthy individuals are buying up huge parcels of undeveloped land and forests, which they then put into Nature Conservancies . . . places where, they hope, all things of and in the earth will flourish as they did before the emergence of mankind.  Human beings, due