Brazil celebrates its Giant Trees on Earth Day 2023 by establishing its own trail of giant trees. The trees - and the animals which rely on them - are threatened and botanists are keen that everyone joins in the effort to preserve the country's unique forests, inside and outside the Amazon. Botanists calculating the carbon content of the garden studied 4633 trees, bushes and palm trees and discovered where the tallest were. To catalogue the volume of the trees, the botanists used lidar technology which stands for 'light detecting and ranging'. This technology was used by the National Oceanic and Atmospheric Administration in the US and is a combined laser, scanner and GPS receiver which generates accurate 3D information. Marcus Nadruz is one of the botanists at Rio de Janeiro Botanical Garden and explains how computer-aided mapping can help measure the trees. The garden was originally created in 1808 to acclimatise plant species from other continents. At the time Brazil was searching

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