Question

shifting agriculture is harmful for the environment

Answer 1

this is because in shifting agriculture vast area of land are Burt down and the trees get burnt which leads to soil erosion and it is very harmful for environment also when trees are burnt down it release harmful gases which go into atmosphere and pollutes it

Answer 2

Yes it is harmful for the environment because trees and leaves are burnt and their ash is added to the soil to increase fertility and after certain period of time the land gets abandoned and looses all its fertility and no crops can be grown on it.
So Shifting Cultivation is harmful for the environment.

Hope it helps you☺