The theme of the International Day of the Preservation of the Ozone Layer in 2014 was "Ozone Layer Protection: The Mission Goes On." This theme implies that the efforts to protect the ozone layer are ongoing and that there is still work to be done. It highlights the importance of continued action and collaboration to ensure the preservation of the ozone layer.

Option 1, "Ozone Day - A healthy atmosphere, the future we want," does not accurately represent the theme of the International Day of the Preservation of the Ozone Layer in 2014. While it does mention a healthy atmosphere, it does not convey the sense of ongoing commitment and action present in the correct answer.

Option 2, "Protecting our atmosphere for generations to come," is similar to Option 1 in that it expresses the goal of protecting the atmosphere, but it does not specifically mention the mission of ozone layer preservation that was highlighted in 2014.

Option 3, "HCFC phase out: a unique opportunity," does not align with the theme of the International Day of the Preservation of the Ozone Layer in 2014. It focuses on the phase out of HCFCs (hydrochlorofluorocarbons), which is undoubtedly an important aspect of ozone layer protection,