If the impact is severe it can cause damage to the surface of the Earth. So we have a regulatory agency and education and warning so that we can prevent damage that would happen instantly lol.
If the impact is severe, it can cause damage to the earth. So we are waiting for the authorities and alert so that we can prevent the damage that occurs to me immediately.
If the impact is severe it can cause damage to the earth. Therefore, we have the agency who study and warning, so we can prevent damage happens in time.