OXFORD, UK - A new study says the recent extreme heat wave in the Pacific Northwest would have been "virtually impossible" without climate change. 

The research by 27 scientists is the first to attribute the deadly heat wave to climate change. 

Their study claims climate change made the heat wave 150 times more likely. 

The scientists warn if current greenhouse gas emissions continue, extreme heat waves could soon start happening every five to ten years. 

The study has not yet been peer reviewed.

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