Câu trả lời :

Deforestation nowadays has been a serious problem for the environment, and most scientists believed it is the main cause of global warming. For me, deforestation is the main cause lea to global warming as well as the "Greenhouse effects"
Deforestation is a serious problem in many countries today. When a lot of trees disappear from the forest in a short duration of time, it can be a forest fire or maybe a loggerhead happen in the area, it is called deforestation. When lots of trees are gone, it can lead to global warming because there is no tree for photosynthesis. Lead to the amount of CO2 and SO2 rise and can cause the "Greenhouse effect" in that area. 
Some people say that not only deforestation but also the disposal of water and air in some factories can also be the cause of global warming. But I don't think that they can participate in this problem. Because the disposal of uncleaned water from factories can be easily cleaned and be controlled by the manager of the factories. And the emission of CO2 and SO2 can be easily cleaned by using some quality fabric to stopped the dust and made the air more cleaner. 
In addition, some problem can directly be the cause of global warming but for me, I think that deforestation is the main problem through it unbelievable cause it may do.