From a bird's eye view, the Amazon rainforest appears as a lush green mosaic of treetops stretching as far as the eye can see. It is home to countless animal and plant species, many of which are endemic, and the forest plays an important role in the global climate as a carbon sink. However, deforestation threatens to destroy this unique ecosystem and its important functions. One-fifth of the area has already been cleared, and there is no end in sight to this intensive use. This has serious consequences for biodiversity and the global and regional climate.