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Article title: « Combien y a-t-il d’arbres sur Terre ? »
The article discusses different studies and estimates regarding the number of trees on Earth. The most recent and complete study, published in 2015 in the journal Nature, estimates that there are approximately 3.04 trillion trees on Earth, with a range of uncertainty between 2.4 billion and 3.6 billion trees. This study used ground-based data and satellite imagery to estimate tree density across the globe. Therefore, the answer to the question is approximately 3.04 trillion trees on Earth.