[aliquando]

Well, the world has been around for anywhere from 4 to 6 billion years. Modern humans (Homo Sapiens), have been around for (very debatable) anywhere from 350,000 to 1.5 years. These numbers are off the top of my head, but its seems to me that the world has been through some drastic changes. Most of it has happened while life has been present. I know that most of it supposedly has only been during the existence of bacteria, but da_n, give us a shot here, we are one very adaptable critter. If you want to go with the Earth only being a few thousand years old, then you can ignore this post. Please add more relevant info, as I said, these numbers are off top of my head. I am pretty good at remembering the sequences and processes, but stink at dates.(ask my wife!)

[UncleJeff]

Agriculture has been around for 10,000 years, all of it climatically stable. All civilizations are dependent on agriculture.

[mountn man]

I am pretty good at remembering the sequences and processes, but stink at dates.(ask my wife!)

May I suggest bathing?

Your wife must have found something worthy in you, if your dating life were so bad, and still she married you.

[mountn man]

These numbers are off the top of my head, but its seems to me that the world has been through some drastic changes. Most of it has happened while life has been present.

Are you saying man because of his presence is responsible for these changes?

Early man (cavemen) caused greenhouse gasses by his flatulence.

You had stinky dates.

Therefore you're a caveman. :)