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Lesson 7 of 8Physical Geography of Canada
Unit 2 · Lesson 7 of 8

Climate Change in Canada: Consequences, Mitigation and Adaptation

How fast Canada is warming and why the North is warming fastest; the environmental, economic, social and political consequences across Canada's regions; the difference between mitigation and adaptation; and how to assess local and regional strategies such as Toronto's green roof bylaw.

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Key things to remember

  1. 1Canada's Changing Climate Report 2026: Canada warmed about 2.0 °C from 1948 to 2023, about 65% faster than the global average (almost twice as fast since 1970); northern Canada warmed about 2.6 °C, more than twice the global rate.
  2. 2The ice–albedo feedback speeds up warming in the North: melting ice exposes darker surfaces that absorb more sunlight.
  3. 3Mitigation reduces greenhouse gas emissions (the cause); adaptation reduces harm from the effects.
  4. 4Consequences can be analysed through environmental, economic, social and political perspectives.
  5. 5Toronto's 2009 green roof bylaw was the first in North America to require green roofs on new large buildings; it helps with flooding, heat and energy use.

Ask an Elder in Pond Inlet, Nunavut, or a grandparent who grew up skating on an Ontario pond, and you may hear the same story: the ice forms later and breaks up earlier than it used to. These are not just memories. Measurements show that Canada is warming faster than the world as a whole, and the effects reach every region, from thawing permafrost in the North to heavier downpours in southern cities. This lesson looks at those consequences and at what communities are doing about them.

How much is Canada warming?

Earth's average surface temperature has risen by more than 1 °C since the late 1800s, mainly because burning fossil fuels and clearing forests have added greenhouse gases, such as carbon dioxide (now over 420 parts per million in the air), that trap heat. The federal government's Canada's Changing Climate Report 2026 found that between 1948 and 2023 Canada's average temperature rose by about 2.0 °C, about 65 percent faster than the global average over that period (and almost twice as fast since 1970), while northern Canada warmed by about 2.6 °C, more than twice the global rate. Part of the reason is the ice–albedo feedback: as bright snow and ice melt, darker land and water absorb more sunlight and warm further.

ice beforeice nowThinning Arctic sea icepolar bears lose huntingground; Inuit travelroutes on ice less safeThawing permafrostfrozen ground softens:buildings and roads sink;releases CO₂ and methaneflowerspollinatorsMarAprMayJunEarlier springflowers may bloom beforepollinators are active,so timing is out of stepnorthrange edge nowrange edge beforeRanges shift northplants and animals moveto cooler places, e.g.ticks spreading northWarmer lakesless oxygen in warm water;fewer cold-water fishsuch as lake troutMore wildfireshotter, drier summers;more forest burns; smokeharms air quality
Fig 1Six climate change impacts in Canada: thinning Arctic sea ice (less hunting ground for polar bears, less safe Inuit travel routes), thawing permafrost (buildings and roads sink, carbon is released), earlier spring (flowers bloom before pollinators are active), species ranges shifting north (such as ticks), warmer lakes with less oxygen for cold-water fish, and more wildfires.

Consequences through four lenses

PerspectiveConsequences for Canada
EnvironmentalThawing permafrost and shrinking sea ice; glaciers in the Rockies and Coast Mountains losing ice; species moving north; warmer lakes with less oxygen; larger fire seasons; rising sea levels on parts of the Atlantic and Pacific coasts
EconomicBillions of dollars in damage from floods, fires and storms; higher insurance costs; winter ice roads to northern mines and communities open for shorter seasons; longer growing seasons in some farm areas but more drought and crop stress in others; new Arctic shipping routes
SocialHealth risks from heat waves and wildfire smoke; Lyme disease spreading north with blacklegged ticks; evacuations and lost homes; threats to Inuit and First Nations food security, travel safety and cultural practices on the land and ice
PoliticalDebates over carbon pricing and emissions targets; who pays for adaptation; Arctic sovereignty as sea ice opens the Northwest Passage; Indigenous rights and leadership in climate decisions
Consequences of climate change for Canada, viewed through the four lenses of geographic perspective.
  • The North: permafrost thaw cracks buildings, roads and runways; thinner, less predictable sea ice makes travel and hunting dangerous; coastal erosion threatens communities.
  • British Columbia: heat domes, larger wildfires, glaciers shrinking and less summer meltwater for rivers, atmospheric-river floods.
  • The Prairies: longer growing seasons, but more frequent drought and less snowpack feeding rivers from the Rockies.
  • Ontario and Quebec: more heat waves in cities, heavier downpours that flood basements and overwhelm sewers, shorter ice cover on lakes, ticks and other species moving north.
  • Atlantic Canada: rising seas and stronger storm surges, coastal erosion on PEI and Nova Scotia, warmer ocean water affecting fisheries.

Mitigation and adaptation

AMitigation: tackle the cause
  • Reduce greenhouse gas emissions or remove them from the air
  • Ontario closed its last coal-fired power plant in 2014
  • Public transit, cycling lanes and electric vehicles
  • Energy-efficient buildings and heat pumps
  • Protecting forests, wetlands and peatlands that store carbon
BAdaptation: cope with the effects
  • Adjust to changes that are already happening or expected
  • Cooling centres and heat warnings during heat waves
  • Bigger storm sewers, flood barriers and floodplain limits
  • FireSmart planning around forest communities
  • Ice-monitoring tools for safer travel in the North
Toronto's green roof bylaw
In 2009, Toronto became the first city in North America with a bylaw that both requires green roofs and sets standards for building them. New developments with more than 2,000 m² of gross floor area must cover a share of their roof (from 20 to 60 percent, depending on size) with plants. Green roofs soak up rainwater, reducing runoff and flooding; they cool the roof and the air around it, easing the urban heat island; they cut energy used for air conditioning; and they create habitat for pollinators. That makes the bylaw a mix of adaptation (flooding and heat) and mitigation (lower energy use).

Some of the most effective local strategies come from communities themselves. SmartICE, a social enterprise whose first community programs were in Nain, Labrador, and Pond Inlet, Nunavut, combines Inuit knowledge with ice-thickness sensors and satellite images, and trains Inuit youth to map safe sea-ice routes. Many cities are planting trees for shade, replacing pavement with surfaces that let water soak in, and building rain gardens. Each strategy has costs and trade-offs, so communities need ways to compare them.

Loading interactive…
Compare the 1991–2020 climate graph of a northern city (Yellowknife or Iqaluit) with a southern one (Toronto or Vancouver): count the months that average below 0 °C, compare the ranges and read the LOWERN panel to see why the North is so cold. That long frozen season is what a warming climate is shortening.
How to assess a strategy
Use clear criteria. Effectiveness: does it really cut emissions or reduce harm? Cost: who pays, and is it worth it? Fairness: who benefits, and who might be left out or harmed? Co-benefits: does it also improve health, habitat or jobs? Scale: does it work locally, regionally or nationally? A strong answer weighs at least two criteria and reaches a clear judgment.

Worked examples

Reveal one step at a time and try to beat it to the next line.

Example 1
Classify each strategy as mitigation, adaptation or both: (a) a heat warning and cooling centres in Ottawa; (b) replacing a gas furnace with a heat pump powered by low-emission electricity; (c) planting street trees in Toronto; (d) raising homes above the flood level in a river valley.
Example 2
Analyse the consequences of thawing permafrost for a community such as Inuvik, NWT, using the four perspectives.
Example 3
Assess Toronto's green roof bylaw as a climate strategy.

Where marks get lost

  • Mixing up mitigation and adaptation. Mitigation cuts emissions (the cause); adaptation reduces harm from the effects.
  • Assuming climate change only matters in the Arctic. Heat waves, floods, ticks and wildfire smoke affect southern Ontario too.
  • Treating every consequence as purely environmental. Climate change also has economic, social and political consequences.
  • Saying Canada is warming at the global rate. Since 1948 Canada has warmed about 1.7 times as fast as the world (almost twice as fast since 1970), and the North more than twice as fast.
  • Judging a strategy on one criterion only. Strong assessments weigh effectiveness, cost, fairness and co-benefits.

Flashcards 8

Mitigation
Adaptation
Canada's warming rate
Ice–albedo feedback
+ 4 more

Practice

1
Which of these is a mitigation strategy?
2
From 1948 to 2023, Canada's average temperature rose by about 2.0 °C, while the global average rose by about 1.2 °C over the same period. About how many times as fast as the world did Canada warm? Answer to one decimal place.
3
What word describes actions that help people cope with the effects of climate change, such as larger storm sewers?
4
Match each climate impact to the region where it is a major concern.
Thawing permafrost damaging buildings and runways
Rising seas and storm surges eroding the coast of PEI
Less snowpack in the Rockies feeding rivers for farms
Heavier downpours flooding basements in big cities
5
Why is northern Canada warming faster than the rest of the country?
6
Which consequence of climate change is best described as political?
7
Toronto's green roof bylaw is often described as both adaptation and mitigation. Which benefit is the mitigation part?

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