I started thinking about this after seeing several articles about falling trees, in particular a few articles about very large trees falling in Los Angeles and New York City. Plus, just thinking about all the wildfires in the Western United States started by trees falling on electrical wires. Although I haven't done extensive research, I did some searching and found the following:
Trees and climate change: Faster growth, lighter wood. This article discusses how "wood density of European trees decreasing continuously since 1870."
So is this a current concern and a global phenomena? Are trees growing faster, but are less strong. Combining this thought with the fact that winds are getting stronger in North America seems very unsettling.