The Chipko movement was successfully launched by

Which of the following is not dangerous for life and the atmosphere?

The $UN$ Conference of Parties on climate change in the year $2011$ was held in

$A$ large number of fish suddenly die in a lake near a village. Which of the following could be the reason for this?
$(a)$ Excessive use of urea and phosphate fertilizers in nearby fields.
$(b)$ Spraying of $DDT$ in the entire area.
$(c)$ The lake water has turned green and murky.
$(d)$ The population of phytoplankton in the lake has decreased,reducing the photosynthetic capacity.
Which two of the above reasons are responsible?

The concentration of an insecticide in the animals of a species is called:

Today,the concentration of greenhouse gases is very high because of: