Top Scientists on the One Mystery on Earth They'd Like To Solve

From the depths of the Amazon rainforest to the deserts of Antarctica, huge questions remain unanswered about life on Earth. The Guardian asked leading scientists and conservationists: what is the one thing you would like to know about the planet that remains a mystery? TLDR, the questions/wishes are:1. How many species are there on Earth?2. I'd go back 540m years to see the 'biological big bang'3. Could some of the smallest life forms help avert climate crisis?4. What is the full biodiversity of the Amazon or Congo basin rainforests?5. How do animals influence the functioning of Earth?6. What will happen to the Gulf Stream?7. Do universal rules govern how plants and animals evolve?8. How many humans could Earth support?9. Which species will adapt to the climate crisis -- and which will not?

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