Question
Global warming is a result of deforestation.

Answer

$-$Global warming means increase in temperature on the earth.
$-$Trees / green cover decrease on earth due to deforestation.
$-$The rate of photosynthesis decreases because of fewer trees. 
$-$Less amount of $\ce{CO_2}$ is used.
$-$Amount of $\ce{CO_2}$ increases in the atmosphere. It traps the heat rays reflected by earth.
$-$So increase in temperature i.e. global warming is a result of deforestation.

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