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

The greatest problem of water conservation is to reduce the amount of

The Kyoto Protocol was endorsed at:

The pesticide used as a preventive measure in buildings is

In a pond near a village,a large number of fish suddenly die. Which of the following could be the reason for this?
$(a)$ Large amounts of urea and phosphate are used as fertilizers in nearby fields.
$(b)$ $DDT$ was sprayed in the entire area.
$(c)$ The pond water has become green and dirty.
$(d)$ The population of phytoplankton in the pond has decreased,reducing the photosynthetic capacity.
Which two of the above reasons are responsible?

What is $FOAM$?