In France, tree mortality has doubled in 10 to 15 years, according to the IGN (National Geographic Institute).
Forests cover nearly a third of French territory, but their condition is deteriorating, particularly due to weather conditions. In an exchange published on September 27, 2026, Manuel Fulchiron, head of forestry at the National Institute of Geographic and Forest Information (IGN), indicated that the number of trees dying has doubled in ten to fifteen years. The institute has just published an atlas dedicated to these ecosystems.
Tree mortality on the rise
Browning leaves, bare trees, branches letting in more light: these signs of fragility were discussed during a meeting in the Bois de Vincennes, in Paris. When questioned by Ava and Rosa-Louise, two 9-year-old children, Manuel Fulchiron confirmed that the trees’ condition had deteriorated.
According to the head of the National Geographic Institute (IGN), tree mortality has doubled in the last ten to fifteen years. He believes that weather conditions play a major role in this trend. He also warned that the summer conditions mentioned during the discussion could negatively impact the trees the following year.
The increase in forest area does not necessarily mean that the trees are healthier. Manuel Fulchiron points out that the forest is expanding, while their condition is not improving.
Climate, insects, and diseases are to blame.
During the discussion, the IGN representative identified climate change as one of the primary causes of tree mortality. He added that insects and diseases can exacerbate the damage. The context presented also highlighted the challenges posed by droughts and fires to forests.
The discussion also touched on the diversity of forest environments. Manuel Fulchiron indicated that there are 190 tree species in metropolitan France, and even more in its overseas territories. He reminded everyone that insects constitute the most numerous animal group on Earth; mammals also live in forests.
An atlas to track the forests
The IGN, which presents itself as a guardian of the forest, has published an atlas based on data and maps. The document provides an overview of these ecosystems, highlighting the press they face, including droughts, fires, insects, and diseases.
At the end of the exchange, Rosa-Louise suggested watering the trees. The discussion was also supposed to address preservation solutions, but the available information does not specify which ones were presented.
Source: Climate: All the latest news in podcasts to listen to (www.radiofrance.fr)
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