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A new tree of life - plant extinction study

Tree_of_life_by_Haeckel.jpgOne in five of the world's plant species are at risk of extinction.

That's the scary figure that came out of a landmark study last year.

Previous estimates were that 70 percent of plants were endangered or vulnerable.

Either way, there's no question that reducing the rate at which we lose living organisms is one of the biggest challenges of our time.

Jonathan Davies - a McGill University expert in extinctions - has been working on how we identify which species are most at risk - so we know which ones to protect.

As he tells Geeta Nadkarni, his international team of researchers has concluded it's not as straightforward as we might think. 

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