We breathe in O2 and breathe out CO2. But trees do the opposite: they breathe in CO2, and breathe out O2. That’s why trees are so important on the planet – we’ve pumped out too much CO2 – because they store carbon in their wood. Kauri trees can store a lot of carbon; they’re the largest rainforest trees in the world.

Photo: the ancient giant kauri tree, Tāne Mahuta (‘god of the forest’), in New Zealand.

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