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This Cape Farewell video clip explains that phytoplankton absorb carbon dioxide and can act as indicators of global warming. The video clip includes a discussion about a hypothesis that increasing phytoplankton could balance the effects of global warming.

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This video applies physics to explain how trees can move water up their trunks over 10m, which is the natural limit of sucked water. The ideas of transpiration, osmotic pressure and capillary attraction are considered.  The explanation shows how a negative pressure is be obtained from the intermolecular forces and...

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