The graphic I chose for my header for now is a major city. People live on top of one another in so many cities. Here is a bit of a rundown of population stats:
1) New York City (8,104,079)
2) Los Angeles City (3,845,541)
3) Chicago City (2,862,244)
4) Houston City (2,012,626)
5) Philadelphia City (1,470,151)
6) Phoenix City (1,418,041)
7) San Diego City (1,263,756)
8) San Antonio City (1,236,249)
9) Dallas City (1,210,393)
10) San Jose City (904,522) so if there should be a natural disaster
Taken from citymetrics.com
So if there should be a natural or man-made disaster, being prepared is just a wise thing to do when you live in a highly populated area. Get to know your neighbors. Get to know who you can 
count on as friends. Be aware of seniors in your buildings and see if they need anything. Our natural tendency is to stick to ourselves; however, as so many things happen keeping track of one another will become important.
And, don’t forget to be prepared if you have pets. Our little friends/family members will need food and water, too.
Stay happy-Stay safe,
John