Your right. Just like the hundred other times the same thing has happened 
To even think that in just 60 -100 years man could have any effect on the earth as a whole, is not only assanine but narsasistic and giving man way to much credit. In 1000 years they will be talking about how man is causing global cooling and somthing needs to be done now.
Ah yes, tell that to the biologists who have kept tabs on things
Man is well known for fucking things up, like the massive kills of Buffalo and effing up the the predator / prey relationship by killing off Timber Wolves, Red Wolves, and cougars...thus causing a huge spike in deer populations around the nation.
Then you have the massive Mammoth kills, and the killing off of megafauna...Thousands of yrs ago, parts of the US were like the African plains, with it's very own version of a Cheetah.
But, looking at ice and ground cores, there is proof that there have been massive earth changes every 5,200 yrs...and whose calendar is 5,200 yrs old?
