Much of the world used to be covered with trees. But most of the world's ancient forests have been cut down.
Whether through clearing of land for agriculture, legal or illegal logging, or expansion of human living spaces - deforestation has had a broad impact on our planet. Many human populations and animal species depend on forests, while the trees themselves have even become threatened or endangered.
Heavy rains has unleashed devastating floods, killing at least 133 people, and forcing more than 100,000 to flee their homes. North Korea is particularly susceptible because of deforestation and crumbling infrastructure.
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.