The SCALE of the flood / pollution /problem > here it means the size ( in a large) way.
The scale of pollution -related problems is beyond your belief .
The scale of the flood is disastrous , to say the least .
You do not know the scale of my problem .
The army armed themselves in a massive scale over the years .
A scale of > here it means something this is having a size in relation to the original something .
This is a small scale model of the palace . .
I want you to built a bigger scale of that house for me .