If we want to preserve forests, we must intervene, says Jacobs, “Now that it is getting warmer, you see that species are suffering. For example, the Norway spruce is having a hard time and is dying, but ash branch mortality is also spreading.” To protect the forests, she is involved in ‘small-scale climate-smart forest management’. For example, the nutrients of dead wood for the soil are examined. Experiments are being done with deciduous trees that shed a lot of leaves and thus provide extra nutrition for the soil, because: “The more nutrition there is in the soil, the better the water management in the forest.”