Some Canadian rivers are at risk of drying up as impacts of climate change intersect with growing water demand from the country's cities, industries and agriculture, a new WWF report has found. 'Canada's Rivers at Risk: Environmental Flows and Canada's Freshwater Future' uses a scientific approach that focuses on the importance of water flow to examine the health of 10 Canadian rivers and reveals that some are dangerously close to drying up. It concludes that Canadians must value their fresh water differently and take immediate action to protect it. Among the rivers at risk is the mighty Mackenzie, one of the world's longest free flowing rivers but one which also rises where climate change impacts are most pronounced. To complicate the river's future, climate change also contributes to another looming threat � increased interest in low carbon hydropower development along the river. Growing water withdrawals from industries such as oil sands development also pose threats. A more encouraging picture comes from the Nipigon in Ontario, once stifled by dams and power development consuming all but three metres of its 95 metre drop from source to Lake Superior in the Great Lakes. Now the dams are operated to restore flows to more natural conditions, and fish populations are showing strong signs of recovery. Tony Maas, Director of Fresh Water for WWF-Canada, said: "Looking at environmental flows forces us to look at the scale that matters most when it comes to fresh water � the watershed. When we do, we find that growing more food, generating more electricity, quenching the thirst of expanding cities, and fuelling industry, are taking their toll on the nation's rivers and converging with the adverse impacts of climate change. "Even seemingly remote northern waters like the Mackenzie are at risk. As temperatures rise, and industrial water withdrawals and interest in hydropower increase, we must start planning now to protect river flows to ensure water security for the communities and economies that depend on them."