Which one is useful as a huge water reservoir?

Among the statements given below,select the ones that correctly describe the concept of sustainable development:
$(i)$ Planned growth with minimum damage to the environment.
$(ii)$ Growth irrespective of the extent of damage caused to the environment.
$(iii)$ Stopping all development work to conserve the environment.
$(iv)$ Growth that is acceptable to all the stakeholders.

The forest cover in the world is decreasing rapidly. What is the main reason for this?

Is water conservation necessary? Give reasons.

List two items which can easily be recycled, but we generally throw them in the dustbins.

State the main purpose of water harvesting management and mention the source which fills the ponds behind harvesting structures.