Fire is no joke.
Cytisus scoparius (Scotch Broom) is invasive and flammable. Fires (not earthquakes) are the natural disasters threatening Nevada County; our neighbor, the Tahoe National Forest, burned in the massive California and Nevada forest fires last summer. The conflagration came within a few miles of my town of Nevada City.
Citizens are banding together to tackle Scotch Broom, which is a significant fuel source. I'm impressed, and think this is a good model for other communities that face danger from flammable plants.