Urbanization is the process in which green space (fields, trees, wetlands, etc) is converted into black space (concrete and asphalt).
There are a lot of local consequenses of this but nothing global (yet)
Acid Rain and the Sulfur Cycle
But although sources - removal is roughly zero notice the following:
1) The dominant removal mechanism is by precipitation (4.0 units). Together with plant uptake, 5.2 units are put back into essentially the top soil but 3.1 units of that runs off leaving 2.1 units in the top soil.
2) The only topsoil removal mechanism, however, is bacteria which process the sulfur at a rate of 1.0 units per year.
3) Hence the burning of fossil fuels and the subsequent rapid deposition of sulfur into the top soil via preciptiation means that lithospheric sulfur is being effectively mined and is deposited into the topsoil
4) Oceans are in even more non-equilibrium due to increased runoff from the land
We measure acid rain in terms of the pH index. Water is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. Each whole pH value below 7 is ten times more acidic than the next higher value.
Effects on Hydrological Cycle: