Saigonnus
Auror
Okay, maybe not exactly WITHOUT salt. If I wanted to design a world much like the Earth (i.e. a rocky planet with a molten core and strong magnetic field); but with a water to land ratio more like 30/70 (basically opposite that of Earth) but instead of having salty oceans, it were to have several large fresh water seas. How would that affect the climate? What other side-effects could you think of about this lack of salt in the water features?