Marc if you just started being concerned about the world; you are a little late to the game. How about a thousand or so years late. Our decline as a species can be related to a host of contributing factors that have created an unsustainable global system. How much longer we have is any one's guess - but if we make it to the next century - I would expect that it is because we received help from alien forces.
Here's my short list of concerns that support Marc's view:
Unbridled growth promoted by neo-classical economic theory that is scientifically flawed and corrupt.
Exhaustion of critical resources required to facilitate global growth in production and consumption.
Rapid deterioration in bio-sphere conditions that are now self-perpetuating and irreversible.
Overpopulation that adds further to the issues noted above.
Geo-political stresses that are certain to breach and cause a global resource conflict.
And on, and on, and on...
So you see that is why I recently built an igloo - I don't have to worry about windows.
Dr Peter G Kinesa
February 2, 2013