![Water droppers battle an out of control forest fire after the city of Prince Albert declared a state of emergency over a fast-moving wildfire, prompting some residents to evacuate, in Prince Albert, Saskatchewan, Canada May 18, 2021. REUTERS/David Stobbe](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/YKMKUDGJYUQWW7QBWVIANPK4OI.jpg?smart=true&auth=02954b36f9773fc9de89bf422fd84477c8c215b7d05ba5e35531be5213515524&width=400&height=225)
A helicopter drops water on a forest fire in Prince Albert, Saskatchewan, Canada. Reuters
A helicopter drops water on a forest fire in Prince Albert, Saskatchewan, Canada. Reuters
Global warming blamed for rise in ‘zombie’ forest fires
Researchers find that fires in Canada and the US survive rain and snow to re-emerge