Which are the three $'R'$s to save the environment?

From what is $LPG$ obtained as a domestic fuel?

$(a)$ Mention any two advantages of constructing dams.
$(b)$ Name a dam which was a subject of much opposition from locals as well as $NGOs$.
$(c)$ Mention any three problems which may arise due to the construction of large dams.

Ground water will not be depleted due to

The $pH$ of a water sample collected from a river was found to be acidic in the range of $3.5 - 4.5$. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the $pH$ of river water?

The important message conveyed by the 'Chipko Movement' is