General discussions of the systemic, societal and civilisational effects of depletion.
by MonteQuest » Tue 27 Nov 2007, 23:47:15
There is a crisis of thinking going on. Too many people are trying to bail the Titanic with buckets, while ignoring the scale and scope required to make any discernible difference.
JohnDenver recently wrote: “Oil will peak, and it will be no big deal because we will smoothly switchover to alternatives.”
Scalability refers to being able to add capacity easily. Currently, we do not have ready-to-scale alternatives with oil's energy density, portability and high EROEI.
Matt Savinar covers this well
here
$this->bbcode_second_pass_quote('Savinar', 'U')nder these sort of conditions, a large scale switchover to alternative sources of energy will be, for all intents and purposes, impossible.
Renewables are not “green” on the scale required. To reach the scale at which they would contribute significantly to meeting global energy demand, renewable sources of energy, such as wind, water and biomass, would cause serious environmental harm. Look at the havoc biofools are creating. The energy produced by the sun and the wind is already being used by other systems. It’s not going to waste. It’s like tapping into a river. You can only divert so much without negative consequences.
$this->bbcode_second_pass_quote('', 'I')t has been commonly assumed that renewable energy generation is more environmentally friendly than the use of nonrenewable energy sources such as fossil fuels or nuclear power. While this assumption may be correct, it must be realized that the capture and conversion of solar energy will have significant negative environmental impacts, especially if they are employed on such a large scale as to supply nearly 100% of the U.S. energy demand.
Limits-to-SustainabilityNot to mention, almost all renewables produce electricity, and not liquid fuel.
$this->bbcode_second_pass_quote('pstarr', 'W')e live in a petroleum world, not an electrical one.
Renewables have severe limitations:
Renewables are diffuse energy sources – The potential energy available is – by any convenient measure of energy density – orders-of-magnitude less than that available from the combustion of conventional fossil fuels.
Renewables are not, generally speaking, dispatchable –Because of their intermittent nature, most renewables must be coupled with an effective energy storage system to have any value as stand-alone reliable power sources.
Renewables have unfavorable economics – Renewable energy technologies, while having very low operating costs, have very high capital costs.
And as I noted earlier, almost all renewables produce electricity in a liquid fuel world.
While this thread could easily be one for the Energy tech forum, that is not my purpose here.
The topic is coming to grips with the scalability required to make any discernible difference, much less allow us to “smoothly switch over to alternatives.”
I don’t think many grasp the orders of magnitude of scale required.
Richard Smalley says it best.
$this->bbcode_second_pass_quote('Smalley', 'B')y the middle of this century we should assume we will need to at least double world energy production from its current level, with most of this coming from some clean, sustainable, CO2-free source.
We simply cannot do this with current technology. We will need revolutionary breakthroughs to even get close… Such innovations in power transmission, power storage, and the massive primary power generation technologies themselves, can only come from miraculous discoveries in science together with free enterprise in open competition for huge worldwide markets.
It means that by 2050 all of the world’s energy demand above what we use now in 2003 – an additional 16 TW -- will have to come from some new energy supply that doesn’t put a single atom of carbon into the atmosphere.
Where can anything like that come from? That magnitude is greater than the entire magnitude of all the energy that the entire world produces now. By 2050, we have to have found the technology to make it and to implement it broadly across the whole world with the ten to hundreds of trillions of dollars it will take to do that.
Where is that magnitude of energy going to come from?.