Question

the area under forest are declining in recent days why​

Answer 1

One of the main reason for the decline of forest cover in recent years because of the increase in population leading to more and more need of land for human activities like housing , factories , roads etc.

Answer 2

Area under the forest is declining  in recent days because of many reasons:

Forest land is being used for farming and human habitation.  

Forest  trees are being cut at rapid rate because they are used in many things.  

Forests are catching fire inn extreme hot weathers that is leading to the decline of huge forests land.

Miners are exploiting forests for their benefits.