The+World+Without+Us+by+Alan+Weisman

It is shocking to read that without mankind, New York city can be in ruins within 20 years. I never knew New York city was so fragile. -Yihao Shen

Yeah I read this as well I thought back and realized that everything is air conditioned and wash to prevent erosion this is why the buildings are so fragile. Also I thought about it and many of the buildings were built between the 18th-20th centuries, some before, so they already have aging on them this is why it is a high possibility that this will occur. -VMiles2010