I think that the Stratospheric Protection Division (SPD) runs regulatory and voluntary programs that protect the Earth’s stratospheric ozone layer and educate the public about sun safety. according to my knowledge We have to care about ozone depletion because a thinner ozone layer allows more harmful(UV) radiation to reach the Earth’s surface.the main think is to protect the ozone layer include requirements under the Montreal Protocol on Substances that Deplete the Ozone Layer and the Clean Air Act.