For hot areas:

1. If temperature is increased, there will be increase concentration through increase in evaporation rate.

2. In water deficient areas the reuse, recycling and water harvesting may increase. In case of reuse more and more dissolved contents will be added, that may become a growing problem. In recycling water will be treated to remove certain suspended and dissolved contents in the form of sludge. That may become another problem. Similarly water harvesting is practiced to capture rain water. This water is stored for a long time. This water, although is not used for human consumption, but will be a big source of Biological pollution.

3. As CO2 is the main driver of global warming. This when get dissolved in water, give carbonic acid. This act upon some non soluble minerals to make it soluble. For example H3CO3 (carbonic acid) react with CaCO3 to covert it into Ca(HCO3)2, which is water soluble. Similarly there are so may minerals that are not soluble in water. CO2 can act upon such mineral and will increase dissolved contents of fresh water systems.

For cold Areas:

I have No idea