Seawater can be turned into freshwater by desalination technology, and the amount of seawater is extremely large. Therefore, there is no need to save the use of freshwater resources. which of the following can most question the above conclusions? ['Pollution of offshore seawater is more serious.', 'High cost of desalination.', 'Glacier water reserves are huge and can replace desalination.', 'The total amount of water on Earth is constant.']