Karlis, on 13 July 2012 - 08:10 AM, said:
And
that makes good common sense Doug.
That said, for the sake of the argument, let's make a hypothetical assumption that everyone in the world would do just that, and more.
The jackpot question: considering that the whole of mankind *
now* contributes in the vicinity of 3% of the total world output of CO2 -- what would be the reduction of CO2 output if everyone followed your example?
My layman's wild guess is that the reduction of CO2 output would be less than 0.003%. My other guess is that even if Mankind went back to a pre-industrial life-style, Mankind's output of CO2 would be so minimal that it would make virtually zero difference to the world's climate.
What are your guesses, Doug?
Karlis
I don't have those numbers off the top of my head, but:
Carbon's residence time in the atmosphere is at least a century, possibly two centuries. That means that conservation alone will not be enough. In four or five decades it will make little difference whether we put extra CO2 into the atmosphere now, or ten years from now. The best approach is to avoid putting carbon into the air at all. And some types of conservation can help with that: things like better insulation in buildings, weather stripping around doors and windows, fiber glass blankets for the water heater, enclosing window walls and doors with plastic sheeting during the winter, turning down the thermostat during the winter and turning it up during the summer.
I have two passive solar heaters built into my south-side windows. They're made from 1/4-inch plywood on a 2X2 wood frame. The outside has a 6-mil plastic cover (polyethylene) and the internal heating structure is aluminum soda cans painted black. It has a sliding door to close the system at night when the "heater" turns into a "cooler." Cheap to build, but the heat output is amazing.
So my guess is that we might get a 1% reduction in atmospheric CO2 levels by applying all this. Compare that with the estimated 0.07% reduction had ALL the Kyoto provisions been implemented, and you can see it's no small amount.
The climate exists in a precarious balance. Anything that happens pushes it one way or the other. A 43% increase in atmospheric CO2 over pre-industrial levels is a major change (We just passed that point.).
While burning of fossil fuels gets most of the press, there are also things like farming methods and deforestation that are having significant impacts. California is in the process of turning the Imperial Valley into a desert through selenium poisoning. That is drastically reducing the soil's capacity to sequester carbon. So not only does the soil no longer absorb carbon, it releases what it was storing into the air. Similar processes are happening all over the world.
The reason that small changes have big impacts is feedback loops. A little more ice melts off this year than last, so the albedo is reduced, resulting in warming of sea water, which melts more ice, which reduces albedo more, which warms the ocean.... And around we go. And there are hundreds of these feedback loops at work.
Though I would prefer to wait just a little longer before declaring our "wild weather" to be evidnce of global warming, there seems to be a growing consenses that this is the case. The US just had the worst drought in its history (Last year's drought here in Oklahoma was worse, but in a more-restricted area.). We are all going to be paying higher food prices because of that (The three-year food reserve the US had back in the 1960s is gone, and with it, our safety net.). Huricane Katrina was the trigger for our current dismal global economy: first, the banks built a house of cards with subprime lending; then, Katrina damaged some drilling platforms in the Gulf and the oil companies used the incident as an excuse to inflate prices; consumers panicked and quit buying things, especially fuel; that sent the economy into a tailspin, etc. etc. It's all tied together.
In order to blame the "recession" in global warming, you would have to blame Katrina on global warming and I don't know if that's possible. But there will be less-questionable storms in the next few years.
Just a thought: the drought-year-normal-year-drought-year-normal-year-drought-year pattern recurs over and over in the central US. 1976-1978-1980 were such drought years; 1932-1934-1936 were, too. In the 1890s there was a "wet" year in the middle to break up the pattern: that time it was 1894-1896-1899-1901. The Civil War Drought (1859-1861-1863) followed the pattern, too. We should be entering the same pattern again, right now. And 2011 was a drought year - but 2012 is not exactly a "normal" year. At any rate, it looks like we're going to be in for several more years of drought, with 2013 and 2015 being prime candidates. What I think I'm seeing is a "normal" ("cyclical") pattern with the effects of warming superimposed on it. After this drought period is over, we will go into a ten-year wet period before going into a variable length "normal" period. Expect the next drought cycle to recur in the 2040s or early 2050s. These droughts have been getting worse over time and have had definite human-caused components, mainly as a result of land clearing that changed heat flows (Think "Dust Bowl."). I think the next one will be something my grandchildren will tell their grandchildren about.
Everything I'm seeing is pointing at climate/weather disasters in the 2040s with lesser disasters between now and then. I may or may not be around to see that, but my kids will. And that's why I am concerned.
Doug
If I have seen farther than other men, it is because I stood on the shoulders of giants.
The beginning of knowledge is the realization that one doesn't and cannot know everything.