Canadian fire crews on Thursday battled to prevent wildfires from reaching the northern city of Yellowknife, where all 20,000 residents are leaving by car and plane after an evacuation order was declared.

A blue-green algae bloom in Yellowknife Bay sparked worry for people's dogs. Here's what an aquatic quality scientist and a veterinarian have to say about it.

As winters get warmer, the number of drowning deaths is going up. "I just don't think we have appreciated that is one of the costs," said one scientist.

The Taltson River, below the hydro dam south of Great Slave Lake, typically sees 215 cubic meters per second. As of November 12, the water flow was recorded as 628 cubic meters per second.

Glacial changes have caused Kluane Lake water levels to drop so low the dock is unusable.