A Documentary History of Conservation in America |
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Page 4
... million years ago , a few evolved in human directions . The members of at least two species learned to use fire as a tool . The two now known as Homo erectus and Homo sapiens expanded their territories for gathering food , first in ...
... million years ago , a few evolved in human directions . The members of at least two species learned to use fire as a tool . The two now known as Homo erectus and Homo sapiens expanded their territories for gathering food , first in ...
Page 198
... million acres now being cultivated . Erosion by wind and water is getting under way on another 100 million acres . More than 300 million acres - one - sixth of the country - is gone , going or beginning to go . This , we note , is on ...
... million acres now being cultivated . Erosion by wind and water is getting under way on another 100 million acres . More than 300 million acres - one - sixth of the country - is gone , going or beginning to go . This , we note , is on ...
Page 253
... million will seek admission or continued enrollment in 1970 ; 10 in 1975 ; 12 in 1980. No one questions our ability ... million ( for a population of 122 mil- lion ) ; by 1950 it was 33 million ( for a population of 151 million ) ; by ...
... million will seek admission or continued enrollment in 1970 ; 10 in 1975 ; 12 in 1980. No one questions our ability ... million ( for a population of 122 mil- lion ) ; by 1950 it was 33 million ( for a population of 151 million ) ; by ...
Contents
Awareness of the Living World | 3 |
MANS DOMINION | 97 |
THE FLAMING SWORD | 267 |
Copyright | |
2 other sections not shown
Common terms and phrases
abundance acres agriculture Aldo Leopold American animals areas beauty become birds buffalo busy monster Canaan Mountain century Charles Galton Darwin chemical cities civilization coal conservation conservationism crops desert Ducktown E. E. Cummings earth ecological ecologist economic environment environmental farm feet fertility fields fish forest future Gerard Piel grass green ground grow growth hills human hundred increase Indians industrial insects John Muir kill lake land land ethic landscape live look man's Mark Van Doren means ment miles million Mississippi mountain National Park nature nature's ocean parathion perhaps pesticides plain plants poison pollution population portions preserve problem produce region reservoirs rich river road rock selection soil spring streams things Thomas Cole thousand timber tion town trees valley vast vegetable Wasichus waste wild wilderness wind woods