A new scientific study reveals that glaciers in Western Canada, particularly southern British Columbia, face substantial melting in the coming decades, with nearly 75% of alpine ice in southern B.C. projected to disappear even if global warming stops today. Published in the journal Science, the research highlights the vulnerability of these ice masses to climate change and the potential consequences for water resources, ecosystems, and landscapes.
Contents
Key Takeaways:
- Western Canada’s glaciers are highly vulnerable to warming temperatures.
- A significant portion of ice loss is already “committed” due to past warming.
- Future warming could lead to near-total disappearance in some regions.
- Loss of glaciers poses risks to water supply, hydropower, ecosystems, and landscape stability.
- Adaptation strategies are necessary as significant melting is unavoidable.
Understanding the Study’s Findings
An international research team, led by glaciologist Harry Zekollari of Belgium’s Vrije Universiteit Brussel, used eight different computer models to analyze the potential future of glaciers in Western Canada and the U.S. Northwest. The study’s projections paint a stark picture.
The planet has warmed by approximately 1.2 degrees Celsius since pre-industrial times. The study found that if warming reaches 1.5 degrees C, 81% of glacier mass in Western Canada and the U.S. would melt. This loss accelerates dramatically with higher temperatures; a 2.7 degrees C increase by 2100 could lead to a 98% reduction in Western Canadian glaciers, described as “near annihilation levels” by the researchers.
Freshwater lake formed by glacier retreat in B.C.'s Tulsequah watershed
Harry Zekollari emphasized the concept of “committed loss,” stating that based on current warming levels, about 40% of the Earth’s year-round ice is already destined to melt by the century’s end. For Western Canada, this committed loss is even higher, nearing 80%. This means a significant portion of the region’s glaciers are likely to disappear regardless of future climate action, a consequence already locked in by past emissions.
Researchers believe the relatively high level of predicted loss in Western Canada is partly due to the limited elevation range of many glaciers in the region. This restricts their ability to retreat to higher, colder ground as temperatures rise. The study also indicated that glaciers in Canada’s southern Arctic face a serious threat, potentially making it one of the worst-hit regions globally for ice loss.
Impacts of Vanishing Ice
Glaciers play a crucial role in regional ecosystems and economies. Globally, nearly two million people rely on glaciers for water used in agriculture, drinking, and washing. Canada, home to over 200,000 square kilometres of glacial ice, is the most glacierized country in the world, making the projected losses particularly significant.
The disappearance of ice masses can profoundly affect local and regional systems:
Water Supply
Glacial meltwater feeds numerous rivers and tributaries, particularly crucial during dry summer months. As glaciers shrink, this reliable source diminishes, potentially impacting downstream communities and ecosystems.
River flowing through landscape of melting glaciers in B.C.'s Taku watershed
Hydropower Generation
In British Columbia, where hydropower provides about 90% of electricity, glaciers contribute significantly to water levels in reservoirs, especially in the upper Columbia region. BC Hydro reports that glacial meltwater currently contributes around three percent of the water used for provincial hydroelectricity, with higher percentages (10-20% annually, up to 50% in summer) in key basins like the Columbia River. While meltwater contribution has increased recently, climate projections suggest future shifts with more water in winter/spring but less during critical summer periods.
Revelstoke dam on the Columbia River
Ecosystems and Fisheries
Melting glaciers provide cold water that is vital for keeping mountain rivers cool, especially in late summer heat. This is critical for sensitive aquatic habitats, including key salmon spawning and rearing grounds. The loss of glaciers could threaten these ecosystems.
Landscape Stability and Hazards
As glaciers melt, they can destabilize surrounding landscapes, increasing the risk of natural disasters. These can include landslides, floods, and even mountain tsunamis. A notable example occurred in B.C.’s Coast Mountains in 2020, where a landslide, triggered by a slope destabilized by melting glaciers, crashed into an alpine lake, causing a massive flood and tsunami.
Elliot Creek tsunami flooding in B.C.'s Coast Mountains
Tourism and Economy
Businesses that rely on ice-dependent natural attractions face significant challenges. Doug Washer, CEO of Head-Line Mountain Holidays in Whistler, described the Pemberton ice fields he uses for tourism as turning into “chunks of Swiss cheese” due to melting. He noted measurable ice loss over decades and is exploring alternative attractions not reliant on ice.
Ice cave in Pemberton Icefield during the summer
Evidence of Rapid Change
The rapid melting of glaciers is not merely a future prediction; it is an observable reality. Between 1985 and 2020, over 1,100 glaciers vanished in B.C. and Alberta alone, with the rate of loss accelerating.
Monitoring programs provide direct evidence of this retreat. For instance, the Wedgemount Glacier in Garibaldi Park, B.C., has receded over 700 metres since monitoring began in 1973. Recent data shows a continued average horizontal recession of 13.4 metres and a height loss of over 14 metres near its toe between 2023 and 2024. This rapid melting has led to the formation of a four-hectare lake since 2006 at the glacier’s front.
Wedgemount Glacier comparison between 2020 and 2024
Experts like Brian Menounos, a glaciologist at the University of Northern British Columbia, corroborate the study’s findings based on his own research, which indicates a rapid increase in melting in southern B.C. glaciers. Factors like wildfire smoke darkening the ice and the concentration of debris can also accelerate melting by causing glaciers to absorb more sunlight.
Adapting to an Unavoidable Future
Given the significant “committed loss” identified by the study, experts agree that adapting to the unavoidable melting of many glaciers is necessary. Brian Menounos emphasized that the question is no longer if these glaciers will melt, but what actions should be taken when they are gone.
The scale of B.C.’s glaciers – around 16,000 spread over 20,000 square kilometres – presents a challenge for comprehensive intervention. While some regions, like Switzerland, have explored strategies such as damming high-altitude lakes or covering ice with tarps to preserve meltwater flow, applying such methods across vast areas of B.C. is not economically feasible.
Experts suggest that planning should focus on the most threatened systems and consider potential adaptation measures. Crucially, any planning should involve First Nations, who have deep historical and cultural connections to these landscapes and waters.
The study underscores the urgency for collective consideration of the impacts of glacier loss and the development of strategies to prepare for a future with significantly less ice in Western Canada.
To learn more about the impacts of climate change on Canadian landscapes and communities, explore related articles on water management, environmental hazards, and regional climate adaptation efforts.
