5°C Climate Risk for Your Clients

Canada is on course for average temperature increases of 5°C by 2100, according to a landmark federal scientific assessment released September 3, 2026. The report, Canada’s Changing Climate Report, was produced by more than 100 academics and experts and published by Environment and Climate Change Canada. For financial advisors managing long-term client portfolios, the findings represent a concrete number to work with—something the industry has been awaiting as climate risk moves from theoretical to material.

The science behind the scenarios

Canada is already warming at close to twice the global average rate, the report finds. Across the current decade and the next, the country will be approximately 2.7°C warmer than pre-industrial levels regardless of near-term emissions reductions—a trajectory driven largely by northern geography, where melting snow and ice accelerate heat absorption. This polar amplification effect means that as Arctic sea ice retreats, the darker ocean surface replaces reflective ice, absorbing more solar radiation and creating a feedback loop that intensifies warming across northern regions. The report documents that this process is already underway, with summer sea ice extent declining and permafrost temperatures rising throughout the Canadian North.

What comes after 2040, however, is not fixed. The report lays out two sharply different pathways. Under a global net-zero pathway achieved by the 2070s, warming would stabilize at roughly 3.5°C above pre-industrial levels by century’s end. Under current global policy settings, which fall well short of that target, Canada faces average warming of 5°C, with temperatures still climbing at 2100.

The 5°C scenario carries specific, measurable consequences. Glaciers across Western Canada would virtually disappear. Winter temperatures across much of Nunavut and Nunavik would rise by more than 10°C. The southern Prairies could face up to five times the frequency of severe droughts compared to today. Coastal communities in Atlantic Canada would experience accelerated erosion as storm tracks shift and sea levels rise, while the boreal forest—the largest land-based carbon store in Canada, would face increased fire activity and die-offs that could release stored carbon back into the atmosphere.

Ryan Ness, Adaptation Research Director at the Canadian Climate Institute, a national climate policy research organization, said in response to the report: “The gap between these two futures is enormous, and the difference will be measured in lives lost, homes destroyed, and communities and livelihoods damaged beyond recognition.”

Portfolio implications advisors cannot ignore

The financial stakes of this divergence are substantial. Research from the Canadian Climate Institute estimates the cost of unmitigated climate damage to the Canadian economy at hundreds of billions of dollars annually by 2100. That figure does not represent a single catastrophic event, it accumulates through repeated extreme weather, infrastructure failures, declining agricultural productivity, and eroding asset values in vulnerable regions and sectors. The Institute’s modelling accounts for cascading effects: a wildfire season that damages timber supplies affects construction costs, which ripples through real estate valuations, which changes the collateral values underlying certain investment structures.

The same research suggests that every dollar invested now in climate adaptation, reinforcing infrastructure, redesigning communities, preparing businesses for floods and heat, returns up to $15 in avoided losses. That ratio functions as a capital-allocation signal as much as a public-policy argument. Insurance companies have already begun repricing risk in high-exposure zones, and lenders are starting to factor climate vulnerability into mortgage underwriting and commercial lending terms.

Clients holding assets in sectors or regions acutely exposed to physical climate risk carry a structurally different profile than conventional modelling tends to capture. Real estate in flood-prone or wildfire-adjacent areas, infrastructure- linked investments, insurance exposure, and agricultural holdings all compound over a 20- to 30-year planning horizon—the timeframe relevant to retirement and estate planning for many Canadian clients.

Policy gaps and planning urgency

The report also surfaces uncomfortable context about federal readiness. Ottawa’s own 2026 progress report on its National Adaptation Strategy acknowledges the country is not adequately prepared for the risks ahead. The Canadian Climate Institute has separately noted that recent federal policy shifts have weakened Canada’s net-zero commitments and its credibility in pressing trading partners for emissions reductions.

Advisors should recognize this as a signal about where policy support may be lacking as physical impacts accelerate. When government adaptation timelines lag, the private sector, including investment portfolios, absorbs more of the consequence.

That said, the report’s authors emphasize this is a description of physics, not inevitability. The worst-case scenario requires sustained policy failure over decades. But the planning window to position client portfolios ahead of escalating impacts is already contracting. Waiting for policy certainty is itself a risk management choice, and not a defensible one given what the science now shows.