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999 Emergency Earth
Click is in Arizona finding out how 'artificial trees' are being developed to suck carbon out of the air. Plus, drones that follow ships to 'sniff' emissions.
Last on
Sat 29 Jun 201902:30GMT
BBC News Channel BBC News UK & BBC News UK HD only
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- Sat 29 Jun 201902:30GMTBBC News Channel BBC News UK & BBC News UK HD only
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