Amazing......!
This statement is not confusing.....
Lets start from your pc or laptop which contain 4 or 2 heat sinker respectively...which run normally 4 to 12 hours daily with very small load of one user.
And within an hour fan begins to through hot air.
Then what about Google servers which are running 24 hours of week. And have burden of whole internet almost.
Just imagine how much heat are produced by these servers....
To overcome this problem they use cooling plants..........