It is, and I did some googling and reading, even had to check out the basics (how salt gets into our seas and oceans), and it seems these are underwhelming findings of imaginary hot air. At its heart seems to be global warming (the manmade/enthropogenic variety!) modelling, by its permanently overheated advocates.
Simply, looking for a sign of our Earth quickly heating up, they looked whether the water cycle, especially evaporation (increased by high temp) and subsequent precipitation is speeding up. They studied it by looking at ocean saltiness, which MAY be increasing (hard to say, big body of water with billions of years history! It could constitute insignificant fluctuation). If indeed saltiness is going up over recent decades, AND IF this were caused by a faster water evaporation followed by more rain, this could be an indicator our climate recently got hotter.
But I have not seen proof global seas have become saltier. (They might.)
No proof such increase in sea/oceanic saltiness was truly caused by faster water cycles (evaporation/rain).
No proof a hotter climate was caused by human activity. (It also could be normal climate fluctuation, caused by billions of years of volcanic and solar changes.)
Personally, after reading up a little, the possible increase in salts in our oceans (coupled with lowering of salts in fresh water layers) could be explained by huge salt sediments released into the water by volcanism and mega-seaquakes (the recent tsunamis), plus highs in solar activity. Let's hope it will veer back before it causes a major climate change or kills off sea life. Fortunately we aren't at that threshold yet.
I'm anything but an expert. Any member who understands this stuff better?