Air turbulence: When can it become dangerous?
Flight turbulence like that encountered by a Singapore Airlines flight on Tuesday is extremely common, but there's one aspect of severe turbulence an aviation expert says can lead to serious injury.
The world's coral reefs are under attack by climate change and more will disappear if oceans keep warming, according to a report released Tuesday.
The study by the Global Coral Reef Monitoring Network (GCRMN), a UN-supported global data network, showed that 14 per cent of the world's coral on reefs was already lost between 2009 and 2018, equal to about 11,700 square kilometres, an area 2.5 times the size of Grand Canyon National Park.
Corals face an "existential crisis," scientists said, as sea surface temperatures rise. The report spanned data for 40 years, 73 countries and 12,000 sites.
Sharp spikes in warming are particularly damaging, a phenomenon scientists say is linked to human-caused climate change.
The study looked at 10 coral reef-bearing regions around the world and found that loss was mainly attributed to coral bleaching, which happens when corals, under stress from warmer water, expel the colorful algae living in their tissues, making them turn white.
One severe bleaching event in 1998 alone killed 8 per cent of the world's corals, the study said.
The hardest hit areas are South Asia, Australia, the Pacific, East Asia, the Western Indian Ocean, the Gulf and Gulf of Oman.
Overfishing, unsustainable coastal development and declining water quality are other factors battering the reefs.
"There are clearly unsettling trends toward coral loss, and we can expect these to continue as warming persists," said Paul Hardisty, chief executive of the Australian Institute of Marine Science, in a statement shared by the United Nations.
The global ocean has warmed faster over the past century than since the end of the last deglacial transition, around 11,000 years ago, the Intergovernmental Panel on Climate Change (IPCC) said in a landmark report in August.
While coral reefs cover less than 1 per cent of the ocean floor, they support more than 25 per cent of marine biodiversity, including turtles, fish and lobsters, which fuel global fishing industries.
The reefs are responsible for an estimated US$2.7 trillion annually in goods and services, including tourism, the report said.
Scientists did find, however, there was about a 2 per cent regain among coral reefs 2019, showing they can be resilient when given respite from the siege of factors working against them.
If pressure is relieved on the coral reefs, they could flourish again within a decade to pre-1998 levels, the report said.
Recent efforts to support coral reefs include a mitigation project off the coast of Caribbean nation Antigua and Barbuda called Ocean-Shot, which uses technology that mimics the design and shape of natural reefs to provide opportunities for colonization by corals and other marine life.
Flight turbulence like that encountered by a Singapore Airlines flight on Tuesday is extremely common, but there's one aspect of severe turbulence an aviation expert says can lead to serious injury.
British Columbia serial killer Robert Pickton was attacked and sustained life-threatening injuries in a Quebec prison Sunday in what officials described as a 'major assault.'
In his latest column for CTVNews.ca, former NDP leader Tom Mulcair argues that if there's an unofficial frontrunner in the eventual race to replace Justin Trudeau as Liberal leader, it has to be former Bank of Canada governor Mark Carney.
The Toronto Blue Jays have offered tickets and a signed baseball to a fan who says she was struck in the face by a 110 m.p.h (177 km/h) foul ball at Friday’s game.
Members of a killer whale pod related to an orphan orca calf that escaped a remote British Columbia tidal lagoon last month have been spotted off the northeast coast of Vancouver Island.
Ontario Provincial Police continue to investigate a long weekend fatal boat collision on Bobs Lake, north of Kingston, Ont.
An investigation has been opened into the death of Matthew Perry and how the “Friends” actor received the anesthetic ketamine, which was ruled a contributing factor in his death.
New inflation data is 'welcome news' for consumers and an economist says it could signal the possibility for a interest rate cut as several core measures also continue to ease.
House of Commons Speaker Greg Fergus is facing fresh Conservative-led calls to resign, this time over "very partisan" and 'inflammatory' language used – the Liberals say mistakenly – to promote an upcoming event.
Montreal photographer captured the moment a Canada Goose defended itself from a fox at the Botanical Garden.
Public libraries in Atlantic Canada are now lending a broader range of items.
Flashes of purple darting across the sky mixed with the serenading sound of songs will be noticed more with spring in full force in Manitoba.
Catching 'em all with impressive speed, a 7-year-old boy from Windsor, Ont. who only started his competitive Pokémon journey seven months ago has already levelled up to compete at a world championship level.
A sanctuary dedicated to animals with disabilities is celebrating the third birthday of one of its most popular residents.
2b Theatre recently moved into the old Video Difference building, seeking to transform it into an artistic hub, meeting space, and temporary housing unit for visiting performers in Halifax.
A B.C. woman says her service dog pulled her from a lake moments before she had a seizure, saving her life.
A Starbucks fan — whose name is Winter — is visiting Canada on a purposeful journey that began with a random idea at one of the coffee chain's stores in Texas.
Members of Piapot First Nation, students from the University of Winnipeg and various other professionals are learning new techniques that will hopefully be used for ground searches of potential unmarked grave sites in the future.