Rationale: CO2 created by humans and water combine and make an acid like substance that then comes down onto earth through rain. The acidic rain reacts with the limestone that older buildings are made of and the rock then begins to weather
Example: the Colosseum in Rome was originally a full shaped dome, it is made with limestone which eventually was weathered away by acidic rain (along with other sources)
Solution: If humans were to make less pollution by less use of cars and other things that produce co2 there would be less acidic rain forming. Also when making buildings limestone should not be used because of it reaction with acid. If buildings are not made with limestone and less acidic rain is produced there will be less weathering of buildings.