How many trees are there on Earth?
In 2015 researchers combined satellite images with tree counts from more than 400,000 forest plots to produce the first proper global tree census. What number did they land on?
Reveal the answer
About 3.04 trillion, roughly 400 for every person alive and around eight times the previous estimate.
— Thomas Crowther and colleagues, Mapping tree density at a global scale — Nature, 2015