Trees are all around the world - they provide shelter, food and wood.
Forests also play a crucial role in absorbing carbon dioxide and thus regulating the global climate. People have already deforested large swaths of the world, with consequences for ecosystems, plants and animals, and even humans themselves.
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Despite conservation efforts, swathes of Brazil's Amazon forest are still lost to deforestation. Small-scale illegal logging can be difficult to monitor, even with satellite-imaging technology. Now, one indigenous tribe is looking to GPS mapping on smartphones to protect their forest.