Depending on the severity, the blast can take down electrical grids, destroy satellites in earth orbit and cause general havoc on earth. When the charged wind hits the geomagentosphere, the field vibrates and sets up massive currents in any conducting system such as the electrical grid, pipelines and even railway tracks. Power grids fail, sensitive electronics are fried by EMP effects and oil and gas pipelines have been known to rupture and burst into flame. The more severe the solar flare, the greater the damage. In hospitals with complex ICU machinery, a flare can literally end up costing lives. During blackouts, some people go on looting sprees. Others wind up creating a subsequent baby boom. These are the most obvious and immediate effects. The military keeps a close watch for these as some could be mistaken for enemy attacks. In summation, flares car have either little or huge impact on human activities.