Inthepast,mandidnothavetothinkabouttheprotectionofhisen...
问题详情：Inthepast,mandidnothavetothinkabouttheprotectionofhisenvironment.Therewerenotmanypeopleonearth,andnaturalresources（资源）seemedtobeunlimited（无限的）.Today,thingsaredifferent.Theworldhasbecometoocro...