Question

Large scale deforestation leads to the decrease in the amount of gas A in the atmosphere whereas the amount of gas B increases. The increased amount of gas B in the atmosphere causes an effect C which leads to excessive heating of the earth and its atmosphere producing an undesirable phenomenon D. What are A, B, C and D ?​

Answer 1

• Deforestation increases the level of Carbon Dioxide (B) and decreases the level of Oxygen (A) in the atmosphere by reducing the rate of photosynthesis.​

• Carbon dioxide gas traps the sun's heat rays reflected by the earth, causing greenhouse effect (C). ​
  

• The gradual increase in the over-all temperature of earth's atmosphere due to greenhouse effect is called global warming (D).​