There are many causes to the overheating of the earth. The greenhouse gases are the most impactful. Due to overheating, the oceans are rising up, causing the future level of sea rise to be dangerous. The water rises since icebergs melt and warm water expands. this could lead to a rising of at least 20 to 30 feet. As Wanless said, over 93% of the warming has been transferred to the oceans, therefore there is no stop to the sea level rising. There are many consequences to this such as losing access to fresh water, failure of sewage treatment plants, abandonment of barrier islands, evacuations…