I haven't posted in this thread for a long time, but something I was reading in a National Geographic magazine caught my attention. The article was about determining the origin of indiginous North Americans and the author was talking about a chain of islands off the western coast of the U.S. that seems to be one of the locations first visited by seafaring explorers. He writes "Sea levels are 300 to 400 feet higher than at the end of the last glacial maximum, which means that ancient coastal sites could lie under hundreds of feet of water and miles from the current shore."
So...think about this...the amount of water in Earth's atmosphere is fixed...at least as I understand it we aren't being bombarded by water from outer space so what we have is what we've had for a long time and what we'll have for a long time. Throughout time there have been periods of global cooling and when that happens the storage for the water moves to the glaciers at the poles of the earth, and during periods of global warming those sheets of ice melt and the water is stored in the oceans.
Just think about how much water must have been stored in those polar ice caps to have raised the level of all the seas on earth by 300 to 400 feet in the last 12,000 to 13,000 years (that's the age of the oldest human remains found in the Americas). We haven't had rises in the overall water levels of more than perhaps a few feet during our lifetimes, and how many lifetimes has man been using fossil fuels? Perhaps a few...although of course certain other "oils" have been used for lighting for milleniums.
At any rate, it seems to me that the huge majority of global warming that melted those polar ice caps must have occurred well before modern man could have made a significant contribution...the question is, has the rise in ocean levels during the relatively "short" period in which mankind has been guilty of gross environmental pollution been faster than that which has been occurring naturally for the past 12,000 to 13,000 years in general.
I guess that's what all the scientific brouhaha is about...but to me it just illustrates the incredible magnitude of the environmental changes that occur naturally over large periods of time here on earth. It's hard to blame those massive ancient effects on mankind...so can we really blame the current effects on mankind?
Again...I think the answer is "MAYBE"???
...but...do we know enough at this time to be able to say for sure? And if we don't, how badly to we need to know for sure? Maybe...just maybe....we'll find out that what we're experiencing these days is the inevitable impact of a multitude of factors, only one of which may be mankind's contribution. If that's the case, I doubt that mankind has the ability or power to stop the "global warming" about which we're seeing definite signs, such as the recession of the glaciers near the north pole.
So...
1. YES
2. YES
3. We can't...so would that be a "NOTHING"?
Cheers!
Doug