Saltwater intrusion from rising sea levels

Ocean currents will be altered, further impacting our climate, and sea levels will rise. Freshwater aquifers will suffer from saltwater intrusion, once habitable zones will become uninhabitable
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Fresh Water Supply - The Greatest Climate Change Issue

I haven't thought about this much but it also makes sense that when sea levels rise they will poison (make too salty to drink or grow plants with) many fresh water sources near to the ocean as the sea levels rise worldwide. So, especially for low lying places near oceans and seas more and more water tables that were once fresh water will contain more and more salt water. So, this is another factor worldwide that people are going to have to deal with on top of everything else.