The carbon cycle | Countryfile
Matt Wilkinson spends time above the canopy, where he can take atmospheric readings and feed that information into forest research and Government data.
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Steve Backshall visits unexplored parts of the world. This time his team is kayaking in the Arctic - they face perilous sea ice and have a terrifying encounter with a polar bear.
2: Arctic Part 2 | Undiscovered Worlds with Steve Backshall
Naturalist and explorer Steve Backshall leads a team on a mission to summit a remote and unclimbed mountain deep in Greenland's Arctic wilderness.