Canadian lakes are warming twice as fast

Canadian lakes are warming twice as fast

A new study has found that Canadian lakes are under threat from climate change.

“Canadian lakes are warming twice as fast as any other lake on Earth,” said biologist Sapna Sharma of York University in Toronto, co-author of an article published in the journal “Bioscience”.

Why are Canadian lakes the most affected?

Over the past 165 years, average air temperature has reduced ice cover by an average of 31 days. This has happened six times faster over the past 25 years, with a total of 6,000 frost-free days.

The temperature of the water increases as it absorbs more sunlight, and the upper layers of the lakes warm up even faster. Lakes around the world are already warming at a third of a degree Celsius per decade, and ice-covered lakes are warming twice as fast as the global average. The average temperature of the world’s lakes is expected to increase by 1 to 4 degrees Celsius by the end of the century.

Marginalized communities are most affected

Sharma worries that many lakes reach a tipping point when they can no longer adapt to their new environment and become something different: “We shouldn’t expect gradual ecosystem responses to change. climate change, his paper reads, but rather to tipping point responses that lead to new ecosystem states once ecological thresholds are crossed”.

Much of these changes will be borne by those least able to do so, Ms. Sharma said. Indigenous or poor people have less access to alternative sources when water quality deteriorates, Professor Sharma said: “The impacts of climate change will affect marginalized communities and poorer communities a lot. earlier than the others. »


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