Answer:
it will become like northern Canada
As the warm water that coming by the Gulf Stream stops,it will result in only cold Arctic water coming down from the Arctic Ocean to take of the place of the gulf stream thus lowering the temperature of the North Atlantic Ocean dramatically.
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
Since you did not give options, I will just help you out by saying that Implied Powers are powers that are <em>Not stated directly but are suggested to be true</em>
