标题: The situation is made worse since many of the earth’s forests are being remo... [打印本页] 作者: 李老师 时间: 2017-7-26 19:51 标题: The situation is made worse since many of the earth’s forests are being remo... The situation is made worse since many of the earth’s forests are being removed，and plant life is being damaged by acid rain.
Thus，the amount of carbon dioxide in the air is continuing to increase.
Pollution also needs to be considered inside our homes，offices，and schools.
Some of these pollutants can be created by indoor activities such as smoking and cooking.