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Here's what climate change could look like in Canada

cbc.ca logo cbc.ca 2018-10-27 CBC/Radio-Canada

The City of Toronto set up seven cooling centres during this summer's heat wave, including one at Metro Hall on July 4, 2018. © Bruce Reeve/CBC The City of Toronto set up seven cooling centres during this summer's heat wave, including one at Metro Hall on July 4, 2018. Climate change is here, experts say, and Canada can expect to suffer the consequences.

The effects of a warming planet are going to be felt from coast to coast to coast. And, if we stick to a "business-as-usual" scenario — no change to our emissions — it's going to happen a lot sooner than scientists initially thought, according to a recently released Intergovernmental Panel on Climate Change report.

In July 2018, Montreal experienced 70 heat-related deaths as the city dealt with unusually hot temperatures into the 30s with stifling humidity that made it feel closer to 40 C. This summer, British Columbia experienced its worst fire season on record. In August, two brief thunderstorms caused widespread flooding in Toronto, bringing the downtown core to a standstill.

With a warming planet, we can expect to see more events like these, experts say.

"People say, well gee, the world's warmed up by 1 C in the last 135 years, but there are parts of Canada that have warmed in some seasons by four, four-and-half degrees in a 70-year period," Environment Canada's senior climatologist, David Phillips says. "So twice as much in half the time."

The greatest differences are seen in the north and the interior of continental coast in the west. The region with the greatest warming in 70 years is in the Mackenzie area of the Northwest Territories where temperatures have risen by between 4 C and 5 C in some parts.

Nationally, the summers have warmed by more than 1 C, with winters warming closer to 1.4 C.

"There are communities on the coast where people are experiencing sea-level rise, erosion and flooding," says Catherine Abreu, executive director of the Climate Action Network, an umbrella group of environmental organizations. Indigenous communities "are experiencing a loss of their way of life because of climate change. So, the impacts are real globally, and they're real here in Canada."

B.C. experienced its worst wildfire season this year, with more than 13,000 square kilometres burned. © B.C. Wildfire Service B.C. experienced its worst wildfire season this year, with more than 13,000 square kilometres burned.

While it may seem like eastern Canada isn't seeing much of a change, it is, and it's catching up to the rest of the country. Rather than the change occurring during the past 70 years, it has occurred over the past 10 or 15, Phillips says.

"There's no region of Canada that's been left out in the cold." 

Canada's future

What does the future hold for Canada?

Phillips used models based on a "business-as-usual" path. Using the median, the models (run by the Laboratory of Mathematical Parallel Systems, or LAMPS at York University), Phillips says people living in Toronto could see 51 days a year above 30 C by 2050 and 77 by 2100. The current average is 16.

But just because temperatures are on the rise, doesn't mean Torontonians will be done with winter completely. While Toronto gets 16 nights of temperatures reaching –15 C or lower, they'll still get 4 by 2050 and 1 by 2100.

Torontonians might not want to celebrate just yet, however: those warmer temperatures bring increased chances of freezing rain events.

In Toronto and Montreal, there could be close to a 50 to 60 per cent increase of these potentially disastrous and costly events.

This image shows a colour-coded map of Canada depicting temperature trends from 1948 to 2012. It illustrates that temperatures are warming across the country. © Environment and Climate Change Canada This image shows a colour-coded map of Canada depicting temperature trends from 1948 to 2012. It illustrates that temperatures are warming across the country.

In the Prairies, growing days are expected to lengthen. That's good news for farmers, but there are also negative consequences. 

"Some regions might benefit from longer growing seasons, but at the same time you have the impact of increased wildfires, for example, the smoke pollution that comes with that and the CO2 emissions," said Felix Pretis, an assistant professor at the University of Victoria who studies the economic impacts of climate change.

The 2013 ice storm in Toronto cost the city approximately $106 million. © Aaron Vincent Elkaim/Canadian Press The 2013 ice storm in Toronto cost the city approximately $106 million.

​ Pretis said that the recent IPCC special report that compared the outcomes of a global temperature rise of 1.5 C versus 2 C is a stark reminder that there could be dangerous and costly outcomes. 

"The report … sends a really strong message that the two degrees that we talked about previously is not really a guardrail anymore, and that we should be very careful about the future," said Pretis.

Costs

Canadians may revel at the prospect of warmer weather, but with that comes a price — literally.

"In Canada, now, the expression of extreme weather risk, the number one negative manifestation by far is flooding," said Blair Feltmate, head of the Intact Centre on Climate Adaptation at the University of Waterloo. "Flooding is the most expensive cost in Canada to extreme weather by a country mile, and specifically, basement flooding.

"This is real on-the-ground stuff that is costing us right now."

Smoke from this year's B.C. fires shrouded Edmonton, making it difficult for some to venture outside. © @Raptor_Chick/Twitter Smoke from this year's B.C. fires shrouded Edmonton, making it difficult for some to venture outside.

Blair notes that, from 1983 to 2008, the cost of catastrophic insurable events annually ranged from $250 million to $500 million. Since 2009, however, in eight out of nine years, these costs have ballooned up to $1 billion or more a year, with a $1.8 billion average.

A brief but soggy thunderstorm in August flooded Toronto streets, costing the city roughly $80 million. © @earthisanocean/Twitter A brief but soggy thunderstorm in August flooded Toronto streets, costing the city roughly $80 million.

Pretis believes that part of the problem stems from the ways scientists are conveying their message about the consequences of a warming climate.

"I'm concerned about the lack of policy response," Pretis said. "I think there's a big challenge also how the scientific community conveys these findings to policy makers … I think we need to carefully translate these findings into local impacts that policymakers can relate to."

The message is clear, he says: Canada needs to prepare for the future.

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