A modern hoarder

pollution: (noun) 

the presence in or introduction into the environment of a substance which has harmful or poisonous effects

    the level of pollution in the air is rising. 

poverty:(noun)

the state of being extremely poor

the state of being inferior in quality or insufficient in amount. 

drought:(noun)

a prolonged period of abnormally low rainfall, leading to a shortage of water

famine:(noun)

extreme scarcity of food. (*scarcity: 부족, 결핍)

drunkenness:(noun)

the state of being drunk

   A growing problem of drunkenness

drug abuse:

the habitual taking of illegal drugs

divorce:

(noun) the legal dissolution of a marriage by a court or other competent body

(verb) legally dissolve one's marriage with someone. 

domestic violence:(noun)

violent or aggressive behaviour within the home, typically involving the violent abuse of a spouse or partner

debt:(noun)

a sum of money that is owed or due

   I paid off my debts. 

  *be in someone's debt; owe gratitude to someone for a service or favour

    God bless you-I am forever in your debt. 

obesity:(noun)

the state of being grossly fat or overweight

   the problem of obesity among children. 

lack of drinking water 

homelessness:(noun)

A person without a home, and therefore typically living on the streets. 

- I think ....is one of the biggest social problems we face. 

- I think this is a growing/rising/increasing problem. 

- this is a worldwide issue. 

- this is an issue which is really specific to Korea. 

- for this not to be such an issue I think we have to ....

- in order to reduce/stop/ this we really should....

- It's a very complex issue, I really wouldn't know where to start!