Is salt, the kind used on sidewalks and roads to prevent and melt ice, bad for

if it is then the entire world is in deep crap..because all the oceans are full of salt
 
WHY DOES EVERYONE THINK EVERYTHING IS BAD FOR THE ENVIRONMENT? Its salt, salt comes from the earth, everything in the world comes from the earth...relax! Oh, its snowing here so im also freaking out about "global warming" LOL
 
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