1.there / a / in / is / of / clean / country / shortage / water / this / clean
=> There is a shortage of clean water in this country.
2.in / children / living / suffer / malnutrition / from / often / slums
=> Children living in slums suffer from malnutrition.
3.serious / overpopulation / it / problem / isn't / a / is?
=> Overpopulation is a serious problem, isn't it?
4.causing / is / more/ overpopulation / we / problems / can / imagine / than
=> Overpopulation is causing more problems than we can imagine.
5.is / main / causing / air pollution / reasons / the / one / of / overpopulation.
=> Overpopulation is one of the main reasons causing air pollution.
6.less / countryside / the/ traffic / there / air pollution / is / and / in
=> There is less traffic and air pollution in the countryside.
7.of / most / Mumbai / is / densely / the / cities / in / one / populated / the / world
=> Mumbai is one of the mose densely populated cities in the world.
8.problem / for / traffic / becoming / congestion / is /a / major / huge / many / cities.
=> Traffic congestion is becoming a majof problem for many huge cities.