an earth directed super CME of half that size would wipe out the global power and communication grids within minutes of hitting earth.
trying to predict one is almost beyond hope though... but we should be preparing for such an event.
Tools of war are not always obvious. The worst weapon is an idea planted in the mind of man. Prejudices can kill, suspicion can destroy, and a thoughtless, frightened search for a scapegoat has an everlasting fallout all of its own.