reaction in megacities

Megacities is the modern city on our new generation today.
Many megacities in reach some are moderate in reach.
The important of this is the quality of life in such megapolises
is proving better than what was once predicted.Many people
says that "Urban explosion is changing the way people live.
Because many opportunities you can get in urban city,like
jobs,education,high technology and also your life becoming
better.Life expectancy is generally longer in the big cities
than in smaller ones or in the countryside.But the main cause
of this ,is the population grows bigger,there will be more demand
for supplies because many people migrated in the urban cities.
Also we can get more kinds of pollution like burning plastics,
dirt from plantation and etc.We can obviate that by recycling
the materials and we can used it in good ways.