Europe's forest are home to a rich variety of plants and animals. They also soak up some of the carbon produced by factories, cars and mines. So why are they in such poor condition?
Whether it's providing a home for bison in Poland, or a perfect habitat for wolves outside of Berlin, Europe's forests play an important role in protecting biodiversity.
They might also save us from catastrophic climate change. We are still burning fossil fuel for energy - a practice the causes the build-up of greenhouse gases in the atmosphere. Scientists have found that forests soak up some of that carbon, which slows the rate of global warming.
But Europe's forests are threatened. Under attack from limestone bombarding, wood thieves and animals hunters, the EU's forests are fighting for survival. Read more in our special collection of stories.