This is the answer because some of our fresh water is in ice caps/glaciers so we will loose fresh water and we will not have fresh water to drink so the planet earth will not have water.
Decreased surface-to-volume ratio. The dolphin's fusiform body shape and reduced limb size decrease the amount of surface area exposed to the external environment.
Increased insulation. Dolphins deposit most of their body fat into a thick layer of blubber.
