The forests of Hawaii are under threat from a predatory species of tree called the Miconia.
Tonight's programme looks at a remote sensing technique which can spot a single Miconia leaf while flying over a forest and weed it out before it does any damage. Plus, adevice that controls foot odours is putto the test.
Presented by Peter Snow and Philippa Forrester, with Jez Nelson , Craig Doyle and Anya Sitaram. Producer Penny Southgate; Editor
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