On this week’s bonus episode of Lever Time Premium, exclusively for The Lever’s supporting subscribers, producer Frank Cappello and reporter Julia Rock sit down with climate scientist Dr. Andrew Pershing, who explains the advent of ‘attribution science.’

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Attribution science is a new field of research that quantifies the role of manmade climate change and its contribution to extreme weather events. In other words, scientists are now able to determine how much of the recent extreme heat in the Southwest is caused by climate change, rather than its correlation with natural weather patterns. Attribution science helps policymakers and the public better grasp the role of human influence in climate-related events — and how to mitigate and adapt to these changes on a more granular level.