I would think this sounds more natural: Polar regions are particularly vulnerable to warming temperatures. Higher temperatures will inevitably result in melting the glaciers in the Arctic. This would lead to rising sea levels. Hope this helps.

Your sentence is probably grammatically correct. But I think the sentence can be improved. I would write: "The polar regions are particularly vulnerable to warming temperatures. Specifically, such rising temperatures would melt the arctic glaciers, which lead to rising sea levels." This sounds more natural to me.

Pretty good could benefit from the odd comma and capital letter otherwise very good