Which of the following is not the feedback of the example in which human activity is responsible for the global climatic changes in the temperature?
I. Global warming causes snow to melt in polar regions
II. Global warming causes increased rainfall, plant growth and photosynthesis
III. Global warming causes increased CO2 release from biomass decomposition
IV. Tropical deforestation causes warming and drying so that remaining forests begin to decline
(a) I & II (b) Only iii (c) Only II (d) II & IV