waste material or things that are no longer wanted or needed
Rubbish
to become or to make something become smaller in size, amount, degree, importance
REDUCE
the number of vehicles moving along roads, or the amount of aircraft, trains, or ships moving along a route
Traffic
to sort and collect rubbish in order to treat it and produce useful materials that can be used again
recycle
damage caused to water, air, etc. by harmful substances or waste
Water pollution
the fact of a country or city, etc. having too many people for the amount of food, materials, and space available there:
Overpopulation
to use something again:
Reuse