Germany's Harz mountains, once known for their verdant spruce forests, have [1]become a graveyard of skeletal trunks after a bark beetle outbreak ravaged the region starting in 2018 -- an infestation made possible by successive droughts and heatwaves that fatally weakened the trees. Between 2018 and 2021, Germany lost half a million hectares of forest, nearly 5% of the country's total.

Since 2010, EU land carbon absorption has declined by a third, and Germany is now almost certain to miss its carbon sequestration targets, according to Prof Matthias Dieter, head of the Thunen Institute of Forestry. "You cannot force the forest to grow -- we cannot command how much their contribution should be towards our climate targets," he said.

Foresters in the Harz are responding by abandoning monoculture plantations in favor of mixed-species approaches. Pockets of beech, firs, and sycamore are now being planted around surviving spruce. A 2018 study in Nature found tree diversity was the best protection against drought die-offs, and more recent PNAS research found that species richness protected tree growth during prolonged drought seasons. The approach marks a shift from Germany's pioneering modern forestry methods, which relied on single-species plantations now proved vulnerable to climate-driven disasters.



[1] https://www.theguardian.com/environment/2026/jan/08/germany-forests-bark-beetle-spruce-co2-carbon-sink-monoculture-aoe