Omen

I was on a bus yesterday. 
An old woman went on the bus
She started to say something
Again and again 
At first people thought she was praying 
Then we got what she was repeating 

We know who you are 
We know where you live
There is no more forgiving 
Again 

People got the message 
They started to back away from her
Fortunately the bus was not crowded
There was plenty of space to back away

But the earth is getting more and more crowded 
The very rich may back away 
To the Mars
Where can the rest of us back away to?