On a local/regional level, I argue climate change. Urbanization is changing the built environment in the DC/Baltimore/Frederick/Leesburg area. More concrete, more roads means we hold onto temperatures more and it kills marginal events. I see this every day on my drive to work. You go from 34 degrees in West Friendship, MD then it shoots right up to 40 degrees when you get on US 29. We're shifting the climate of the planet and it's just a fact at this point.