The probability of an asteroid striking earth is small, but if it did, the damage could be unimaginable. 65 million years ago the earth was filled free grazing dinosaurs before it was struck by a 10 kilometer asteroid.
Our earth, which probably looked more like Venus at the time, experienced extreme weather patterns and climate changes. The immediate impact caused a firestorm followed by what is known as a nuclear winter.
Dust, smoke, and debris rose up in a mushroom cloud blocking out the sun’s rays, and Planet Earth was sent into a very long ice age. The first evidence we have of Global warming gradually brought the temperatures back to normal finally, but gosh! Those poor dinosaurs.