In an ecological crisis,whose interference plays an important role?

Provide the full names for the following abbreviations:
$(i)$ $HFC$
$(ii)$ $CFC$

Pesticides with very low biodegradation but strong affinity for fatty tissues are:

Discuss the role of women and communities in the conservation and protection of forests.

Jhum cultivation:
$I.$ Also called as slash and burn agriculture,is the farming practice in North Eastern states of India.
$II.$ Farmers cut down the trees of forest and burn the plant remains.
$III.$ The ash is used as a fertilizer and the land is then used for farming or cattle grazing.
$IV.$ After cultivation,the land is left for several years,so as to allow its recovery.
Which of the statements given above are correct about Jhum cultivation?

More than $70\%$ of the world's freshwater is contained in $............$.