Forest ecosystems
The forest is one of the most important ecosystems when it comes to climate protection. This is because forests are a natural carbon sink as trees convert CO2 into oxygen via photosynthesis and incorporate the carbon into their biomass. Almost one third of the Earth's land area, more than four billion hectares, is covered by forests (FAO 2020). Germany would fit into this area over 100 times. Almost half of the forests are in the tropics, followed by the boreal, temperate and subtropical latitudes. Forests are particularly important for regulating the climate. In the EU alone, it stored an amount of carbon equivalent to almost 440 million tonnes of CO2 per year between 2010 and 2020. That is about ten percent of Europe's gross greenhouse gas emissions in this period (Forest Europe 2020).
However, there are indications that this sink capacity is declining not only in Europe but also worldwide. There are two reasons for this: Firstly, the forest area is shrinking due to deforestation, and secondly, existing forests can store less carbon. On the one hand, this is due to natural disturbances such as storms and drought, the frequency and intensity of which will increase due to climate change. On the other hand, the increasing ageing of forests in Europe is causing higher harvest rates.