We survived one back in the sixth century [1]. There's some speculation that the European Dark Ages were caused by this impact rather than the end of Roman rule (the traditional interpretation).
But the biosphere got itself back to its previous state remarkably quickly, apparently, though it's hard to tell if that event contributed to the end of the Medieval Warm Period and the start of the Little Ice Age.
But the biosphere got itself back to its previous state remarkably quickly, apparently, though it's hard to tell if that event contributed to the end of the Medieval Warm Period and the start of the Little Ice Age.
[1]http://www.dailymail.co.uk/sciencetech/article-1248518/Did-a... apologies for the appalling quality of the reference but I couldn't find the journal articles from google.