New research finds that European forests have become more vulnerable to insect pest outbreaks over the last four decades, and especially since the year 2000. They focused on three major threats: wildfires, insect outbreaks and \"windthrows,\" or strong winds that can rip up trees by the roots. In general, wildfires tend to kill off the most trees, followed by windthrows and finally insect outbreaks. Insect outbreaks, on the other hand, are causing more damage almost everywhere across the continent. But recently scientists have raised red flags about insect outbreaks.