Why is $Van Mahotsav$ celebrated?

The process of planting trees in a forest area to increase forest cover is known as ..........

Which of the following are the main harmful effects of deforestation?
$I.$ Increase in carbon dioxide concentration in atmosphere
$II.$ Loss of biodiversity due to habitat destruction
$III.$ Disturbance in hydrologic cycle
$IV.$ Desertification
Which of the statements given above are correct?

Jhum cultivation leads to

In the Amazon rainforest,deforestation was carried out for the cultivation of which crop?

What is the percentage of forest loss in tropical and temperate regions,respectively?