Acid Rain is an aftermath when water molecules mixes with fossil fuels. When it rains the acidic droplets then damage trees, fish in lakes and ponds, and make the soil contaminated. The vegetation find it harder and harder to grow. Please look at the example of the plant unable to grow larger after acid rain affected it. Acid Rain also damages the leaves of trees and plants.  

Citation:

“Acid Rain.” Ice-Albedo Feedback: How Melting Ice Causes More Ice to Melt – Windows to the Universe, www.windows2universe.org/earth/Atmosphere/acid_rain.html. 

https://www.windows2universe.org/earth/Atmosphere/wildlife_forests.html