Eli5 water displacement question, I think.

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Ok, so my question is rather dumb and I apologise in advance.

If I have 500ml of warm water, and I place exactly 500ml of ice into said water, when it melts will it make it up to 1L?, and if so why is global warming such an issue because isn’t there more water on earth than there is ice, so wouldn’t it just melt away. (I’m not taking away from the fact global warming I not an issue) I was just making something that needed to cool quick so I put ice in it and it made me curious!!

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