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Sticking to the first law of thermodynamics and the rule of three
Jean-Marc Jancovici [email protected] [email protected] [email protected]
IHP - October 2015
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According to you, what is energy?
My electricity or gas bill
Something I’m full of when I really feel great
Something to be saved! (why can be unclear)
What changes the world, or I missed something?
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Energy, stronger than euros (or dollars) By definition, energy = change :
Counting energy is therefore nothing else than counting how much the physical world has changed
Change of temperature
Change of position in a field
Change of speed
Change of chemical composition
Change of atomic composition
Creating or absorbing radiation…
Change of shape
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The laws of physics will always remain stronger than our desires
The law of conservation imposes that man can only take advantage of a source of energy that already exists in the environment (primary energy)
All primary energies are free: no one ever paid a single cent for the formation of oil, gas, waterfalls or coal. Fossil fuels are as free as renewables.
The “cost of energy” represents only salaries and rents that had to be paid to other humans in the course of extracting energy from the environment. Nature never gets paid.
The more an energy source is diffuse and non manageable, the more expensive it will be. It’s just physics.
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1 L
≈ 0,5 kWh
80 kg + 10 kg up 2000 m
0,05 kWh per day (10 kWh/year)
6 m3 earth lifted up 1 m
x 10
10 kWh 2-4 kWh
mechanical output
x 100
@ 1000 €/month: 200 €/kWh
1,5 €/L : 0,4 €/kWh
2000 €/kWh
÷ 500
÷ 5000
1 day out of 2: 100 kWh/year
Even a slave: 4-40 €/kWh ÷ 10-100
Nietzsche wanted supermen, oil did the job
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Energy consumption per capita, 1880 to 2013. Source: Jancovici, 2014, on primary data coming from Schilling et al., 1977, BP Statistical Review, 2014, UN & World Bank 2014
20.000 kWh per person and per year ≈ 200 “energy slaves” per capita
Yummy kWh, or plenty of (fossil) food for plenty of machines…
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Very moral, very efficient, but alas not renewable at all
=
200 (world average) to 600-1000
(Western average)
+
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Resources Capital
Productive system Production
Muscles = 1
Machines + Energy = 200 !
Actually, you'd better have some resource!
Work
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Energy consumption vs. GDP in constant $, 1965 to 2014. Source World Bank 2015 for the GDP, BP Statistical Review 2015 for energy
The best macroeconomic model in the world: a straight line
1965
2014
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No energy, no GDP
Annual change of the world energy consumption (green) and the world GDP (blue). Source World Bank 2015 for the GDP and BP Stat 2015 for energy
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1000 years with no growth
World GDP reconstituted from 0 to 2003. Source Maddison, 2010
1800 years with almost no growth
3% per year for eternity?
No fossil fuels: no need to promise any growth!
Beginning of fossil fuels
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CnHp
O2
CO2
Present job structure, leisure and holidays, long studies, health, retirement, globalization, information society, urban concentration and sprawling…
Crack?
Boom?
Free !!
= GDP
The fire age, perpetual growth and two questions
Ores & minerals, oceans and soils, wood, all living species… (all free also)
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Mathematics are definitely hateful
As soon as an initial stock is given once and for all (fossil fuels, ores…), mathematics allow to demonstrate that :
It is impossible to have an indefinitely rising extraction
It is even impossible to have an indefinitely constant extraction !
In such a case there is only one possibility for the annual extraction :
It is nil at -∞
It is nil at +∞
It goes through an absolute maximum in between
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Mathematics are definitely hateful
As soon as an initial stock is given once and for all (fossil fuels, ores…), mathematics allow to demonstrate that :
It is impossible to have an indefinitely rising extraction
It is even impossible to have an indefinitely constant extraction !
In such a case there is only one possibility for the annual extraction :
It is nil at -∞
It is nil at +∞
It goes through an absolute maximum in between
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The peak !
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Conventionnal Deep offshore
Extra-heavy
Refinery gains NGL CTL,
biofuels
So…
World liquid production, by primary source. Source : « Transport energy futures: long-term oil supply trends and projections », Australian Government, Department of Infrastructure, Transport, Regional Development and Local Government, Bureau of Infrastructure, Transport and Regional
Economics (BITRE), Canberra (Australia), 2009
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And if we don’t want a massive change?
Temperature increase in 2100 arising from cumulated emissions since 1870. IPCC, 2015
2015
Cumulated CO2 emissions since 1870 in Gt
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Back to high school or almost
Emission scenarios leading to radiative forcing scenarios. IPCC, 2015
÷ 3
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If we want to lower emissions, it is better to know where they are
Breakdown of world GHG emissions in 2014. Jancovici, on various data.
Energy use: no more coal!
Eating (meat dominates)
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Fancy a little rule of three ?
To be divided by 3 by 2050… and will!
+ 25% in 2050?
The Kaya identity:
+ 2% per year = x 2 in 36 years; + 4% per
year = x 4 in 36 years!
Magic technique N° 1: ! NRJ per $ of GDP
Magic technique N° 2: ! CO2 per kWh = +nuke, RE, CCS & switch coal -> gas
Problem: ≈ 0% in 15 years!
Problem: ≈ 0% in 15 years!