Just reporting some interesting stuff about these lumps of rock.
The Russian asteroid impact (>10 metres means "asteroid" not "meteoroid") was 15 metres wide, 7000 tonnes, entered atmosphere at 40,000 mph. Exploded at 20-25 km altitude with energy of ~300 kTonnes. These things almost always explode at high altitude, fortunately, but bigger than ~25 metres will impact.
Hiroshima was 15 kTonnes.
DA14 is 65 metres wide, travelling at ~25,000 mph. If it ever impacts Earth, which won't be in our lifetimes, the energy would be around 10,000 kTonnes. Equivalent to an earthquake of ~7.5 I think.
The Russian "Tsar Bomb", detonated in northern Siberia in 1961 released an energy of 57,000 kTonnes. Big, but far from causing global damage. Equivalent to earthquake of 8.35
Asteroids larger than 1km would cause global damage, but these are unbelievably rare.