by Tanada » Sat 19 Dec 2015, 09:45:26
I started posting this over on the Coal thread but then after thinking about it I came to the conclusion that it is worthy of a much fuller discussion. Megaprojects have occurred all through human history, the Great Pyramids, Tower of Babel, Maya Pyramids, Machu Pichu, Nazca Lines, and many other examples. However since cheap fossil fuel energy became available the number of megaprojects our modern culture has built are massively greater. To anyone from 1840 or earlier a building like the Empire State Building or the Eiffel Tower was a Megaproject.
As we wind down the fossil fuel use we have a closing window to build additional megaprojects to sustain our population for a few more generations. The Roman Empire built stone and concrete aqueducts to all their major cities bringing fresh water in from sources of many miles distance to provide plenty of water that was clean and healthy to use. As we wind down the fossil age we should consider how best to prepare with our last burst of fossil energy for the lower energy age dead ahead.
I really wonder about the climate change angle on all this projection. On the one hand if every future winter is like the El Nino winter we are having this year heating demand in the mid latitude north is way down, but on the other side of the coin cooling demand in the low latitude subtropics goes up. Then you also need to factor in desertification of crop lands that in wealthier countries like the USA will lead to large scale irrigation involving a lot of energy to move water from source to farmland. I suppose individual farmers, even the huge agribusinesses of the Great Plains won't be able to do that without significant government assistance.
To sum up I think climate effects are at best a wash in the energy demand and at worst a large increase until we just can't afford to use the energy except for vital services. For example how much would it cost to build a pipeline from the mouth of the Columbia river to Southern California along the coastline? The pipe would take in river water right before it discharges into the Pacific Ocean where the states it flows through have already gotten all the benefits they can from it so as to not cause any economic hardship directly to those states north and east of California. The pipeline can be under water so it is out of sight, out of mind, and a heck of a lot cheaper than the pump Lake Michigan scheme that crops up every five years or so. But we need to build it now while we can still pay for the embedded energy expense. The longer we wait the harder it will be to complete a mega project like this.
$this->bbcode_second_pass_quote('Alfred Tennyson', 'W')e are not now that strength which in old days
Moved earth and heaven, that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.