Answer:
Asteroid/Comet Impact Regional
Such a body is expected to hit the Earth about once every million years or so, and would release energy equivalent to about 10,000 megatons of TNT, a little greater than the energy released in a nuclear war, and enough to cause nuclear winter event (see graph above)
Explanation:
Asteroid/Comet Impact Global: 1 in 75,000
Asteroid/Comet Impact Regional: 1 in 1,600,000
Airplane Crash: 1 in 30,000
Firearms Accident: 1 in 2,500
