関連ワード:
what steps were taken to prevent the ozone layer depletion what steps were taken to prevent the ozone layer depletion explain in three full sentences what steps are being taken to reduce ozone layer depletion what steps are being taken to reduce ozone layer depletion class 10 what measures are taken to protect the depletion of ozone layer how can we prevent the ozone layer depletion what major step has been taken to stop the depletion of the ozone layer how can we protect the ozone layer from being destroyed
