00694cam a2200205 4500 76129358 TxAuBib 20010817120000.0 ||||||s1994||||||||||||||||||||||||eng|u 93-48536 (OCoLC)29548443 TxAuBib Canby, Thomas Y. Our Changing Earth. WAshington,DC. : National Geographic Soc., 1994. 200 p.--includes index. 20010817. 1.Environmentalism. 2.Environmental degradation Citizen participation. 3.Man Influence on nature. 4.Conservation of natural resources. TXMTH