Canada’s coastal communities in race against time

Sea level maps show Canada’s coastal communities are in race against time

From the slow-paced, tree-lined streets of downtown Charlottetown to the modern, western architecture of metro Vancouver, Canada’s urban waterfronts are a beacon for condo developers, tourists and everyone in between.

But even in best-case scenarios for global warming, a new series of interactive maps that illustrate the impact of rising sea levels suggest Canada is facing a mind-boggling challenge to keep such popular and often historic neighbourhoods from becoming lost at sea.

John Clague, an earth sciences professor at Simon Fraser University in British Columbia, says thanks to global warming, our oceans are getting an average of 3.3 millimetres higher every year, up from 2 mm a year in the latter half of the 20th century.

Related: Freezer malfunction melts arctic ice samples used in climate change research

The United Nations predicts the world’s oceans will be at least one metre higher by the end of the current century. After another 100 years, it could be four times that.

“I call it a disaster in slow-mo,” said Clague. “It is really a huge problem. It’s a global problem and the cost of dealing with this or not dealing with it, depending on what happens, is enormous.”

The U.S.-based organization Climate Central has created interactive maps (http://bit.ly/2j3lJu3) that show how Canadian cities could look if the average global temperature rises between one and four degrees Celsius by 2100. All of the scenarios are based on no mitigation efforts taking place, although some areas do already have existing dikes or protections.

The world has already passed the one-degree threshold. The Paris climate change accord aims to stave off 2 degrees by the end of the century, but the United Nations warned last week the world has committed to only one-third of the emissions cuts necessary to meet that goal.

The Climate Central maps show that in Charlottetown, the harbourfront will be at risk at two degrees. At four degrees, homes several blocks from the waterfront would become oceanfront properties. Lennox Island, a First Nations community off the northwest coast of P.E.I., could lose its bridge to the mainland in the best case scenario. At worst, the entire island disappears beneath the sea.

In Halifax, the harbourfront, port and rail lines could all be submerged. The city of Charlemagne, Que., east of Montreal, could lose entire neighbourhoods to the St. Lawrence River at two degrees, while at the four-degree threshold, the birthplace of singer Celine Dion has almost no dry spots at all.

Related: Climate change could impact fish

The problem could well be most dire in Vancouver, said Clague.

“Metro Vancouver is the most vulnerable urban area in Canada to sea level rise,” he said. “We have about 250,000 people living within about a metre of mean sea level.”

At two degrees, hundreds of homes and businesses in North Vancouver would be underwater, as would large parts of the False Creek waterfront. At four degrees, famed Stanley Park becomes an island and the Vancouver neighbourhoods of Mount Pleasant and Fairview become a sea of blue.

Richmond, B.C., is only one metre above sea level now, but director of engineering John Irving said Wednesday the city has been preparing for sea level rise for years. Between building up existing dikes and building “superdikes” that are more than 50 metres wide, the city is getting ready as fast as it can, he said.

In most communities, flood prevention is in the early planning stages, focused largely on preventing new development in high-risk areas and building dikes around existing areas to try and keep them from harm.

Then there are the costs: Clague said in the Fraser Delta area alone, it would cost a projected $10 billion to build up against coastal and Fraser River flooding.

The Fraser Basin Council in 2016 found 71 per cent of its existing dikes were vulnerable in the event of a major coastal flood or on the Fraser River.

The cause of rising sea levels is twofold. Global warming is happening twice as fast in the Arctic as it is in the rest of the world, and sea ice is melting at a rapid pace. In addition, the oceans are warming up and warmer water takes up more space.

Mia Rabson, The Canadian Press

Just Posted

Bracing for Kelowna enrolment spike

Catchment zones recommended for four south central schools

Study: Many cars don’t have winter tires

With a break in the winter in the snow in Kelowna, now is the time to get good tires

Lake Country resident competes in Irish dance championship

Kelowna - Minirva McCarthy-Harley is dancing in the North American Irish Dance Championship

Funding to mitigate wildfire risk

South Okanagan’s regional district applies for $525,000

Kelowna-MP defends Canada’s new UN peacekeeping commitment

Stephen Fuhr says new plan will have a much needed “multiplier” effect

Run, hide, fight — surviving an active shooter situation

A former Kelowna cop teaches how to survive an active shooter situation

Trudeau mania, Scheer enthusiasm in B.C. this week

Prime minister, Conservative leader drop in on Surrey. White Rock

Forecasters promote avalanche safety awareness to kick off season

Avalanche Canada advising backcountry enthusiasts to get proper training and equipment.

B.C. church defaced with disturbing anti-Christian graffiti

Staff at Crossroads United Church reported the vandalism to police late last week

PayPal ordered to disclose business accounts to Canada Revenue Agency

Online payments company has 45 days to hand over information identifying its account holders

Federal government to boost treatment options for opioid drug users: minister

More than 2,800 people died last year as a result of the overdose crisis

Ambulance design changes urged after B.C. man falls out, dies

A coroner’s jury makes recommendations after hearing about death of Ebony Aaron Wood

Suspects in Penticton shooting caught on video

RCMP released CCTV video of a shooting incident at Fairhaven House

Have your say about water rates in Kelowna

The city is conducting a survey to review of the agriculture irrigation rate design

Most Read