The worst U.S. wildfire-related smoke event since at least 2006 is beginning to recede, at least for major East Coast cities, even as dangerous summer fires continue in Canada. Why it matters: What happens in Canada doesn't stay in Canada, as the US smog crisis of the past few days has shown. But there are also global interests to worry about, as the US's northern neighbor is also breaching carbon emissions milestones. (Andrew Freedman)

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