Scientists say Australia's Great Barrier Reef has experienced the worst coral die-off ever recorded due to global warming. Warm seas around the reef have killed two-thirds of a 700-kilometer stretch of coral in the past nine months, according to new research. Subscribe to us on Youtube: https://goo.gl/lP12gA Download for IOS: https://itunes.apple.com/us/app/cctvnews-app/id922456579?l=zh&ls=1&mt=8 Download for Android: https://play.google.com/store/apps/details?id=com.imib.cctv Follow us on: Facebook: https://www.facebook.com/cctvnewschina Twitter: https://twitter.com/CCTVNEWS Google+: https://plus.google.com/+CCTVNEWSbeijing Tumblr: http://cctvnews.tumblr.com/ Weibo: http://weibo.com/cctvnewsbeijing