article_snippet: Impacts that leave behind a 62-mile (100km) diameter crater or less, such as those that struck the Clearwater lakes, are widely thought to have no global effects.
article_snippet: Even if the Clearwater Lakes impacts were caused by a double impact, the extra energy released by two bodies smashing into the Earth simultaneously would have had no significant effect on life.
article_snippet: While the fireball and earthquake would have decimated any life within a few hundred kilometers, the Clearwater Lakes impacts were not big enough to cause much chaos on a global scale.
article_snippet: It's unlikely that the event that formed the Clearwater Lakes had any significant impact on life. 
article_snippet: Even if the Clearwater Lakes impacts were caused by a double impact, the extra energy released by two bodies smashing into the Earth simultaneously would have had no significant effect on life .