There are roughly 2.5 million dairy cattle in Australia.
Dairy farms send a tick over 9 billion litres of milk to the factory every year and around 2.1 billion litres end up on breakfast cereals and in drinks.
A city of one million souls uses 274,000 litres of milk per day. That is the output from around 27,000 cows.
Today there are 472 cities with more than one million inhabitants and 25 with more than 10 million.
These are amazing numbers.
Makes you think.