Answer :
The primary reason of extensive deforestation over the last three to four decades is Loss of Carbon Sinks has increased the concentration of greenhouse gases in the atmosphere.
Tropical timber of Brazil absorb Carbon so are known as sinks . Now with deforestation as sinks are lost, the junking process of Carbon from atmosphere has declined, leading to increased attention of green house feasts in atmosphere.
The slight tilt of Earth changes the area of light commerce, causing the intensity of light to drop. It also changes the number of daylight hours. The components projecting towards sun recieves further radiation due to slight tilt of the earth.
All these factors lead to seasons on Earth.
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