There are more poor people in our towns and cities than first meets the eye.  A lot of poverty is normally hidden.  Natural disasters put all of the problems out there for us to see.
Being able to evacuate a city requires a lot of resources, from individuals, families and government at every level.
For example, there are a lot of people in our society without access to a car: the disabled, very elderly, young people and the poor.  
In my extended family there are at least 3 or 4 people that myself or my spouse would have to reach and help transport.
How many people in your neighbourhood or family would need help in the event of a disaster?  
Important for us to take stock and think about these issues before problems arise.