Re: What are the diseases and problems caused by overpopulation for humans?

There are many examples of overpopulation and disease. I assume by 
overpopulation you mean closeness of proximity, etc. Given that you are in 
New York, the most obvious example and which is relevant would be that of 
tuberculosis which is now endemic in the Big Apple (because of the number 
of people and the decline in vaccination). On a smaller scale, you could 
use the examples of concentration and refugee camps where cholera can 
become a problem. On an even smaller scale, you could use the example of 
headlice (perhaps common cold would be a better example) in a closed off 
class room, where transmission is very common given they are all within a 
small enclosed area in closs proximity and the ease of transmission. 
Disease is an obvious one but other problems could include food shortage eg 
Africa (though the drought hasn't helped), cost of living and resulting 
socio-economic impact eg increase in homelessness, crime. One very good way 
to demonstrate all of this of course, if you have teenage kids is to get 
the game Sim City. Set up a really good city, overpopulate it, and voila, 
the kids get to experience the problems first hand :-)