How does chemical weathering affect the human world?

Chemical weathering in geology is the process by which rock is worn down or disintegrated through chemical processes. Most often, acid rain hits rock surfaces and begins the chemical weathering process. Chemical weathering is responsible for transforming bedrock into soil, and the role of soil is critical to the survival of many organisms, including humans. A primary function of soil in the human world is the production of agriculture. Without soil, there would be no way to meet the energy demands required by the current human population.
Soil's role is far more involved than simply hosting edible crops. Soil plays a number of roles within food webs and energy distributions. Non-edible plants and microbes require soil as a medium for life. Those organisms are intertwined in ecosystems inextricably. For example, trees and other plants provide habitat for numerous birds, mammals, fish, reptiles, amphibians, and insects. Without chemical weathering, there would be no creation of soil. Without soil, our world would look much different than it does today.
 
Chemical weathering, however, is not limited to the disintegration of rock. Chemical weathering can also occur in human-made structures. When acid rain occurs, the acid can chemically erode buildings and other human-made structures. In this case, chemical weathering has a detrimental effect on humans, as it accelerates structural deterioration.
http://www.ux1.eiu.edu/~cfjps/1300/weathering.html