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Katie Critchlow is CEO of NatureMetrics, a company that, well, measures nature. But how?

"We use eDNA; that's all the DNA that's left behind in the environment by every species because every species in the world contains DNA," she explains during the livestream discussion "Time for nature: Turning biodiversity risk into opportunity," hosted by GZERO in partnership with Suntory.

But the animals and plants you see, Critchlow points out, are only a tiny fraction of total life on earth. There's a lot of very small stuff too.