World authority on threatened wildlife classifies 96 percent of assessed coral reef systems as "critically endangered".

The World Health Organization warned on Thursday that Africa faced a "complex" Ebola outbreak after the virus crossed from east Africa to Nigeria, marking the first case in the west of the continent. Nigeria on Tuesday had announced an imported case of the Bundibugyo strain, currently causing a major Ebola outbreak in Democratic Republic of the Congo. It was detected in the wife of a diplomat who had travelled from Uganda to the Nigerian capital Abuja. Health minister Muhammad Ali Pate on Thursday said the woman's contacts had been tracked down since her arrival in Nigeria earlier this month, and that an undisclosed number of "high risk" individuals "have been quarantined, fully, in a facility". Nigeria, the continent's most populous nation, is the fourth African country affected by the outbreak. Kenya, in the east, has reported nine cases since October 6. The outbreak began in DRC and has become the deadliest in the country's history, killing more than 4,000 people out of more than 9,000 confirmed cases since mid-May, according to health authorities. It is caused by the Bundibugyo strain of the virus, for which there is still neither a vaccine nor a specific treatment. "We are facing a more complex outbreak landscape," Mohamed Janabi, regional director for WHO in Africa, told an online media briefing. The patient in Nigeria arrived in the capital Abuja on October 3 after being in Uganda since September 16, the WHO representative in Nigeria Pavel Ursu said. She flew to Abuja on an Ethiopian Airlines flight and transited through Addis Ababa, an emergency meeting of the Nigeria Centre for Disease Control and Prevention (NCDC) heard on Wednesday. The woman is originally from Uganda but based in Abuja, Africa Centres for Disease Control and Prevention Director General Jean Kaseya told AFP on Thursday. He also said she did not go to DRC, as suggested earlier by Ugandan authorities, who have pushed back against new cases being linked to their country after being declared Ebola-free earlier this year. Kaseya said officials are trying to piece together her travel history to establish where she could have been exposed – including the possibility that there might have been contact at the airport with Kenya's first victim, who also left Uganda on October 3. The Nigerian case has reignited memories of a widespread west African outbreak that struck several countries and killed more than 11,000 people between late 2013 and 2016. Nigeria successfully held back that outbreak within its borders, resulting in only 19 infections and seven deaths – raising confidence the densely packed nation of 240 million can respond effectively to new public health threats. "It is contained, so far, the imported case. We have no evidence it has gone into the communities," Pate told a news conference in Abuja. "So our focus is on the contact tracing and ensuring that we know exactly where those contacts are." (AFP) Edited by Cecil Wong

The Nasdaq Composite dropped 2.6% on Thursday as worries over spending on artificial intelligence ramped up.