? ? ? ?Today the quality of our natural environment has become an important issue. The world population is rising so quickly that the world has become too crowded.?
It is undeniable that the worsening environment has become the biggest concern of the present-day world. Land resources are dwindling because of water...
Environmental problems are as big as not for individual country or individual people to address. In other word, we have reached the stage that environ...
Many times, we should adapt ourselves to the environment. In real life, we often feel that the environment is unsatisfactory: poor natural conditions,...
