John Gibbons joined The Last Word to discuss the way in which ancient fir trees are allowing scientists to measure climate change.
Catch the full chat by pressing the 'Play' button on this page.
The Last Word With Matt Cooper
John Gibbons joined The Last Word to discuss the way in which ancient fir trees are allowing scientists to measure climate change.
Catch the full chat by pressing the 'Play' button on this page.
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