Unfortunately, trees and other vegetation — if not planted in the right place — are not always compatible with our energy needs. The network that crisscrosses North America includes about 5 million miles of high-voltage distribution lines (the ones that run down our neighborhood streets), 450,000 miles of very high-voltage transmission lines largely running across the natural landscape, and 300,000 miles of underground liquid and gas pipelines. Trees growing near this enormous system can pose several problems. Kids climb trees and can be exposed to dangerous electrical lines. Tree care workers and homeowners might not know the danger that these lines pose to them as they do their daily work.