The once-lush Greek fir (Abies cephalonica) woodlands in the charming village of Kalavryta, in southwest Greece, are beginning to exhibit worrying signs of deterioration. Hundreds of dead trees highlight the catastrophic effects of protracted droughts and rising heat, their scarlet needles standing out against the remaining green. Greek fir forests are in danger as climate change picks up speed, making them more vulnerable to pest infestations and dwindling snow cover. This article examines the causes of this crisis and its broader implications.

Drought and Pests: A Lethal Combination

Greek fir trees prefer cooler, wetter climes. Still, Greece has experienced unrelenting drought in recent years, which has weakened the trees and left Greek fir forests in danger, making them more vulnerable to pest infestations. In Kalavryta, Katerina Kolirou, the head of the local forest service, observes a significant change: healthy, green firs are becoming increasingly scarce, whereas previously there were only a few dead trees scattered across the terrain.

Wood-boring beetles are the main offenders, taking advantage of the trees’ vulnerability. These beetles burrow into the bark, depositing eggs and forming tunnels that impede the flow of nutrients, ultimately causing the trees to die, according to Dimitrios Avtzis, a forest entomologist with the Greek Agricultural Organization Demeter. They may not have as many populations as bark beetles, but they nonetheless cause just as much damage.

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Climate Change and Declining Snow Cover

Greek fir forests are facing more difficulties as a result of the global climate crisis. With average temperatures exceeding 1.5°C above pre-industrial levels, 2024 was the hottest year on record. According to Kostas Lagouvardos, head of research at the National Observatory of Athens, temperatures have increased similarly in Greece, with some mountain regions in the northwest seeing an even larger 2°C increase between 1991 and 2020.

A vital supply of moisture for fir trees, snow cover, has decreased by 30–40% as a result of this warming. Insufficient snow causes the soil to dry out, which puts additional strain on the trees and exacerbates the drought’s impacts. Extreme heat is also causing the Abies alba fir species to decline in Spain’s Pyrenees, indicating a regional trend of forest vulnerability. This problem is not exclusive to Greece.

Removing dead and infected trees is one way to prevent the spread of pests in Kalavryta’s forests, but these efforts may not be sufficient. Although there is no way to avoid climate change, Lagouvardos stresses the importance of mitigation measures. However, alternatives like artificially creating snow are impractical. Not just in Greece, but throughout the Mediterranean, the deterioration of Greek fir forests is a sobering reminder of the broader ecological costs of climate change. The existence of these crucial ecosystems is in jeopardy as temperatures rise and snow cover decreases, necessitating swift action to address the underlying causes and preserve what remains.

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