Ecological 'doom loops' edging closer, study warns

Extreme weather events such as wildfires and droughts will accelerate change in stressed systems leading to quicker tipping points of ecological decline, according to a new study.

US haze from Canada fires rare and extreme event: expert

The air pollution swamping the northeast United States this week from smoke spewed by fires in Canada is "exceptionally rare" and "extreme", said Ryan Stauffer, a NASA scientist specializing in air pollution.

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