The U.S. just suffered through its hottest June ever. There are legions of scientists blaming the scorching conditions on a record number of wildfires tearing through the American West.

But what happens once firefighters leave—and nature endeavors to rebuild depleted forests.

In the mountains of Colorado, where researchers are becoming more and more concerned that pine, fir, and spruce trees are struggling to come back.

CGTN’s Sean Callebs reports.

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