The premise of the movie is incorrect. The ozone layer blocks harmful ultraviolet light, which is a very important function to most life on this planet, but is not a barrier preventing the cold of the mesosphere from reaching the ground. Ozone is an oxygen molecule with three oxygen atoms rather than two, and the photochemical reaction of oxygen to ozone and back is what absorbs the UV wavelength energy. The ozone layer is between 12 and 19 miles above the earth, but if it were compressed to the atmospheric pressure at sea level, it would only be about 3 millimeters thick. The danger in a "rift" or hole in the ozone layer is rapid sunburn and possible genetic damage. During some years there is a hole in the ozone layer over Antarctica; during other years it isn't there, and during yet other years it spans the entire Antarctic.