Chemical pollutants banned more than 40 years ago are still having a devastating effect on marine life and could lead to the disappearance of half the world's killer whale populations before the end of the century.
원문출처 : https://www.cnn.com/2018/09/27/health/orca-killer-whale-pollution-intl/index.html
원문출처 : https://www.cnn.com/2018/09/27/health/orca-killer-whale-pollution-intl/index.html