Why should the age of humans start only 200 years ago?
By the 19th century the oak forests of England were all but gone because of building the English navy for hundreds of years. Their empire in India provided the majority of future ship lumber until the age of steel ships.
Going back a few more centuries there is a strong argument being made that the Romans were responsible for much of the deforestation of the Mediterranean.
Mans impact on the planet goes back more than 200 years.
http://en.wikipedia.org/wiki/Deforestation_during_the_Roman_period