Question

How does a local water budget differ from the water budget of the whole earth?

Answer 1

The way that a local water budget differs from the water budget of the whole Earth is that the local water budget is not balanced and the whole Earth is balanced.
Some societies in their local communities have more water than others, meaning that at the local level, these budgets are not equal, because some budgets are higher than the other ones. However, if you take a look at the budget for the whole planet, you will see that it is pretty balanced.