Daniel1960, on 2013-March-26, 11:12, said:
I will agree with all your points, with #6 being the only one of great concern. The use of water for irrigation, industry and drinking can and does lead to local shortages. The entire water issue revolves around the point with which you do not consider; an increasing human population. Thesu uses lead to increasing amounts of "waste water," which runs off towards the great ocean sink (water surplus). Indeed, much research as gone into assessign the sea level rise due to ground water depletion for these uses. The global circulation and water cycle cannot refresh these reservoirs as fast as they are being depleted. Increasing use of desalination will be required in the future to supply fresh water.
I would not think of the oceans as being a sink for fresh water. Roughly 80% of the earth's surface is ocean today, and if the ocean level increases by inches
it will still be about 80%. So the oceans should not be considered a sink, since the bulk of water dropped on land was originally salt-water.
As to the human population, I do consider that, but not with respect to the water cycle. Humans are NOT a water sink. All the water that comes in goes out. Respiration and urination keep it in balance no matter what the total population.
The human population plays a key role in the arguments about atmospheric CO2. But you won't see the lawyers and politicians that write up the finding of the climate change proceedings admitting that human population is even one of the driving variables in the models. (it is not politically palatable to suggest that the solution to GCC is a REDUCTION of the human population. ROFL.)
Even normal wars are not sufficient to drive down the population. Historically, only disease has been capable of that. Scientifically, we have reached the point where disease invention could be a GCC "solution". For sure, we now have the military capability to reduce the human population.
Will we some day need to reach that point philosophically and religiously. Those two do seem to be lagging science by a few millennia.
Our "faith" in science to solve our problems might exceed our scientific ability to solve our problems with "faith".
Or we might recognize that the models predicting our demise suffer from a problem most clearly stated by the famous Yogi Berra.
"Predictions are hard, especially about the future."
The corollary to that is that they are especially hard, the farther into the future you make them!
125 years ago, (before cars) "scientists" worried about the climate could rightly have been worried about our civilization being buried in horse manure - if they had bothered to notice the trends in population and transportation.