a great deal of talk is heard these days about protecting threatened animal species,preserving forests, improving the environment, and even restoring the "quality of life". And yet these notions very sometimes seem hazy and the motives behind them are as a rule neither very clear nor very rational. The case for the conservation of nature must be more satisfactorily explained before it can be more effectively defended.
Some 10,000 years ago, an abundant and noble form of animal life, the mammoth, disappeared forever from the face of the eath