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.
Greek prosecutors have charged 20 people, including senior officials, in connection with the deaths of 100 people in a massive wildfire last year. The fires in the seaside town of Mati were the deadliest in post-war Europe, spreading rapidly and trapping people in their homes and cars. Regional politicians, police and fire officials are among the accused as Anthee Carassava reports.