jean-pascal van ypersele - climate.be · jean-pascal van ypersele (université catholique de...
TRANSCRIPT
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Climate change: a challenge for the 21st Century, but also a business responsibility, and an opportunity
Jean-Pascal van Ypersele (Université catholique de Louvain) Former IPCC Vice-Chair (2008-2015)
Twitter: @JPvanYpersele EDF Luminus, Brussels, 27 June 2016
Thanks to my team at the Université catholique de Louvain for their support, and to Geert Fremout (Federal Climate Section) for slides about COP21
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Chamonix, June 2016
Jean-Pascal van Ypersele (@JPvanYpersele)
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!"#$!%&'(&)*+,%&-$#.$/+0$#123$45((67&8$'9*:(;$
Source: !"#$%%!&'"!(&)('*%#+,#-.!*/))0$1,"'#2)*3
45((67&8$ ;$
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2015=warmestyearsince1880
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Coralreefsaredying
AmericanSamoa(fromwww.globalcoralbleaching.org)
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"&60$?@$%<$)A($B*(+)$C+**7(*$D((<$A+=$+:%7>(>$'%*+6$E6(+'A7&8$E6(+'A7&8
DEF3='!:#-0$-3G3=HE3E)1:#)3+@3IJ")00)1")3@+#3E+#-03H))@3>:'($)!3*3K+.3L#$(,)3-1(3D-.)!3M)##;3
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Arc,cSeaIceCover
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B. Holt - JPL!
Greenland Ice Mass Loss 2002-2009 !Derived From NASA GRACE Gravity Mission!
Greenland!
Chan
ge in
Ice
Mas
s Los
s Gig
aton
s!
J. Wahr, U. Colorado!
Velicogna, Geophysical Research Letters, 2009!
•Contributes to sea level rise!
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G'+6($"<$I6%%>7&8$F'*%==$J9*%K(3
N-!"-03H+!!$,1+03*3H)':)#!3
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G7L$M((N=$M%*)A$%<$*+7&$A+=$<+66(&$7&$)A*(($>+0=$%:(*$K+*)=$%<$I*+&'($
O-#/'!3>"B#)$A)#3*3=N3
%:(*$K+*)=$%<$I*+&'($
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OA($P%9:*($+&>$/9=(($>Q"*=+0$7&$R+*7=$(:+'9+)(>$)A(7*$:+96)=$
P)+Q#+;3R-13S)#3T-!!)0:3*3P)U;3V.-,)!3
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H&$B(*S+&0-$S+&0$*(=7>(&)=$M(*(&Q)$K*(K+*(>$<%*$)A($S+==$T%%>7&8$+=$)A($*+7&$K(6)(>$>%M&3
O-UB$-!3>"B#-()#3*3=N3
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http://www.motherjones.com/kevin-drum/2012/10/lying-statistics-global-warming-edition
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LyingWithSta,s,cs,GlobalWarmingEdi,on
http://www.motherjones.com/kevin-drum/2012/10/lying-statistics-global-warming-edition
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LyingWithSta,s,cs,GlobalWarmingEdi,on
http://www.motherjones.com/kevin-drum/2012/10/lying-statistics-global-warming-edition
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WhytheIPCC?
toprovidepolicy-makerswithanobjec,vesourceofinforma,onabout
• causesofclimatechange,• poten,alenvironmentaland
socio-economicimpacts,• possibleresponseop,ons
(adapta,on&mi,ga,on).WMO=WorldMeteorologicalOrganiza,onUNEP=UnitedNa,onsEnvironmentProgramme
Established by WMO and UNEP in 1988
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What is happening in the climate system?
What are the risks?
What can be done?
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IPCC AR5 Synthesis Report
Key messages from IPCC AR5 ! Human influence on the climate system is clear ! Continued emissions of greenhouse gases will
increase the likelihood of severe, pervasive and irreversible impacts for people and ecosystems
! While climate change is a threat to sustainable development, there are many opportunities to integrate mitigation, adaptation, and the pursuit of other societal objectives
! Humanity has the means to limit climate change and build a more sustainable and resilient future
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(Lüthi et al.,2008, NOAA)
+30% 2015
The concentrations of CO2 have increased to levels
unprecedented in at least the last 800,000 years.
1000 years before present
CO
2 Con
cent
ratio
ns
(ppm
)
Atmospheric concentrations of CO2!
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AR3 AR2
AR1 AR4
A Progression of Understanding: Greater and Greater Certainty in Attribution AR1 (1990): “unequivocal
detection not likely for a decade”
AR2 (1995): “balance of evidence suggests discernible human influence”
AR3 (2001): “most of the warming of the past 50 years is likely (odds 2 out of 3) due to human activities”
AR4 (2007): “most of the warming is very likely (odds 9 out of 10) due to greenhouse gases”
IPCC
=H73?456WC3XV:3$!3(L)*(S(60$67N(60$3?+((!3Y73+':3+@3655C3:B-:3B'.-13$1Z')1")33B-!3A))13:B)3(+.$1-1:3"-'!)[3\3
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Carbon cycle: unperturbed fluxes
Units: GtC (billions tons of carbon) or GtC/year (multiply by 3.7 to get GtCO2)
120
70.5
70
2300
Atmosphere pre-ind : 597
38000 Ocean
3700
respiration
Physical,
Chemical, and Biological
processes
photosynthesis 119.5
280 ppmv (1ppmv = 2.2 GtC) GtC
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Carbon cycle: perturbed by human activities (numbers for the decade 1990-1999s, based on IPCC AR4)
Units: GtC (billions tons of carbon) or GtC/year
120
70.5
70
2300
Atmosphere pre-ind : 597
38000 Ocean
3700
GtC + 3.2/yr
déforestation (& land use changes) Fossil fuels
6.4
-244 +120 -40
1.6 sinks
2.6 respiration
2.2
Physical, Chemical, and
Biological processes
photosynthesis 119.5
[email protected] Stocks!
280 ppmv + 1.5 ppmv/yr (1ppmv = 2.2 GtC)
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Thecarboncycleispolicy-relevant• CO2accumulatesintheatmosphereaslongashumanemissionsarelargerthanthenaturalabsorp,oncapacity
• Historicalemissionsfromdevelopedcountriesthereforema`erforalong,me
• Aswarmingisfunc,onofcumulatedemissions,thecarbon«space»isnarrowingfast(tostayunder1.5or2°Cwarming)
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RCP Scenarios: Atmospheric CO2 concentration!
AR5, chapter 12. WGI- Adopted version / subject to final copyedit!
Three stabilisation scenarios: RCP 2.6 to 6 One Business-as-usual scenario: RCP 8.5
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Only the lowest (RCP2.6) scenario maintains the global surface temperature increase above the pre-
industrial level to less than 2°C with at least 66% probability
(IPC
C 2
013,
Fig
. SP
M.7
a)
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18-20000 years ago (Last Glacial Maximum) With permission from Dr. S. Joussaume, in « Climat d’hier à demain », CNRS éditions.
Sea level: 120 m lower
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Today, with +4-5°C globally With permission from Dr. S. Joussaume, in « Climat d’hier à demain », CNRS éditions.
Transition took 4000 years, not 100 years
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+0.3
+4.8
IPCC lower estimate by 2100
IPCC upper estimate by 2100
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^%*)A$J9*%K($W$/+K$%<$)(SK(*+)9*($'A+&8(=d$#1e2f#211$M7)A$*(=K(')$)%$$
2ge3f#11.$7&$)A($D!ReZ.$='(&+*7%$4+&&9+6;$
VNEE3]P63^$_B3=!!)!!.)1:3H)%+#:3?^$1-03S#-_C3
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^%*)A$J9*%K($W$/+K$%<$K*('7K7)+,%&$'A+&8(=$7&$#1e2f#211$M7)A$*(=K(')$)%$$
2ge3f#11.$7&$)A($D!ReZ.$='(&+*7%$4+&&9+6;$
VNEE3]P63^$_B3=!!)!!.)1:3H)%+#:3?^$1-03S#-_C3
7&$)A($D!ReZ.$='(&+*7%$4 ;
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Sea level due to continue to increase
(IPC
C 2
013,
Fig
. SP
M.9
)
(Ref: 1986-2005)
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With 1 metre sea-level rise: 63000 ha below sea-level in Belgium (likely in 22nd century, not impossible in 21st century)
(NB: flooded area depends on protection)
Source: J.P. van Ypersele et P. Marbaix (2004) See www.climate.be/impacts
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(Time 2001)
Effets sur le Delta du Nil, où vivent plus de 10 millions de personnes à moins d’1 m d’altitude
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With 8 metre sea-level rise: 3700 km2 below sea-level in Belgium (very possible in year 3000)
(NB: flooded area depends on protection)
Source: J.P. van Ypersele et P. Marbaix (2004) See www.climate.be/impacts
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Global ocean surface pH (projections) Ocean Acidification, for RCP 8.5 (orange) & RCP2.6 (blue)
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Oceans are Acidifying Fast ……….
Changes in pH over the last 25 million years
Turley et al. 2006
•! It is happening now, at a speed and to a level not experienced by marine organisms for about 60 million years •!Mass extinctions linked to previous ocean acidification events
•! Takes 10,000 s of years to recover
Today is a rare event in the history of the World
Slide courtesy of Carol Turley, PML
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DJFseasonalchangesinheavyprecipita,on(%),2071-2100comparedto1971-2000
IPCC,AR5,WGII,Chap.23,p.1277
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IPCC AR5 Synthesis Report
HSK+')=$+*($+6*(+>0$9&>(*M+0$•! Tropics!to!the!poles •! On!all!continents!and!in!the!ocean •! Affecting!rich!and!poor!countries (but the poor are more
vulnerable everywhere)
AR5 WGII SPM
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Risk=HazardxVulnerabilityxExposure(Katrinafloodvic,m)
APPhoto-LisaKrantz(hUp://lisakrantz.com/hurricane-katrina/zspbn1k4cn17phidupe4f9x5t1mzdr)
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Flood risk adaptation in Bangladesh (example): cyclone shelters, awareness raising, forecasting and warning
Sources: IPCC SREX (Special Report on extreme events…) and IPCC AR5, H Brammer, Clim Risk Management 2014 p.51-62
Sources: IPCC SREX (Special Report on extreme events…) and IPCC AR5, H Brammer, Clim Risk Management 2014 p.51-62
"#$%$&!'(!)#$(*%+,!-.$*+/0+(12,!3+4!5($**!67898:;!+<2.=2%>$,!$?!%#+!!5$11=,>%@!A2*+4!'>*2*%+(!B(+"2(+4,+**!B($C(211+!(=,!D@!%#+!3+4!5($**!>,9EEFG7887!
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IPCC, AR5, SPM, Figure SPM.8
Regional key risks and risk reduction through adaptation
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H3I;!J0KK;!A$L!MBNO9!P>C=(+!9!!
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Cumulative emissions of CO2 largely determine global mean surface warming by the late 21st century and beyond.
Fig. SPM.10
© IP
CC
201
3
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Fig. SPM.10
Limiting climate change will require substantial and sustained reductions of greenhouse gas emissions.
© IP
CC
201
3
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IPCC AR5 Synthesis Report
The window for action is rapidly closing 65% of the carbon budget compatible with a 2°C goal is already used NB: this is with a probability greater than 66% to stay below 2°C
Amount Used 1870-2011:
NB: this is with a probability greater than 66% to stay below 2°C
1900 GtCO2
Amount Remaining:
1000 GtCO2
Total Carbon Budget:
2900 GtCO2
AR5 WGI SPM NB: Emissions in 2011: 38 GtCO2/yr
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IPCC AR5 Synthesis Report
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L-!)(3+13^$,'#)3g&d3 AR5 WGIII SPM
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GHG emissions accelerate despite reduction efforts. Most emission growth is CO2 from fossil fuel combustion and industrial processes.
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]+#/$1,3P#+'%3VVV3"+1:#$A'h+13:+3:B)3VNEE3^$_B3=!!)!!.)1:3H)%+#:3
Can temperature rise still be kept below 1.5 or 2°C (over the 21st century) compared to pre-industrial ? •! Many scenario studies confirm that it is technically and economically feasible to keep the warming below 2°C, with more than 66% probability (”likely chance”). This would imply limiting atmospheric concentrations to 450 ppm CO2-eq by 2100.
•! Such scenarios for an above 66% chance of staying below 2°C imply reducing by 40 to 70% global GHG emissions compared to 2010 by mid-century, and reach zero or negative emissions by 2100.
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Can temperature rise still be kept below 1.5 or 2°C (over the 21st century) compared to pre-industrial ? •! These scenarios are characterized by rapid improvements of energy efficiency and a near quadrupling of the share of low-carbon energy supply (renewables, nuclear, fossil and bioenergy with CCS), so that it reaches 60% by 2050.
•! Keeping global temperature increase below 1.5°C would require even lower atmospheric concentrations (<430 ppm CO2eq) to have a little more than 50% chance. There are not many scenario studies available that can deliver such results, requiring even faster reductions in the medium term, indicating how difficult this is.
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IPCC AR5 Synthesis Report
Mitigation Measures More efficient use of energy Greater use of low-carbon and no-carbon energy - Many of these technologies exist today - But worldwide investment in research in support of GHG mitigation is small… Improved carbon sinks - Reduced deforestation and improved forest management
and planting of new forests - Bio-energy with carbon capture and storage Lifestyle and behavioural changes
AR5 WGIII SPM
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Chamonix,June2016
Jean-PascalvanYpersele(@JPvanYpersele)
Technologymatters,butisnotenough
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Chamonix,June2016
Jean-PascalvanYpersele(@JPvanYpersele)
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All sectors and regions have the potential to contribute by 2030
Note: estimates do not include non-technical options, such as lifestyle changes.
(avoided emissions: the higher, the better)
IPCC AR4 (2007)
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• Substantial reductions in emissions would require large changes in investment patterns e.g., from 2010 to 2029, in billions US dollars/year: (mean numbers rounded, IPCC AR5 WGIII Fig SPM 9)
• energy efficiency: +330 • renewables: + 90 • power plants w/ CCS: + 40 • nuclear: + 40 • power plants w/o CCS: - 60 • fossil fuel extraction: - 120
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Since AR4, there has been an increased focus on policies designed to integrate multiple objectives, increase co-benefits and reduce adverse side-effects. •! Sector-specific policies have been more widely used than economy-wide policies.
•! Regulatory approaches and information measures are widely used, and are often environmaentally effective.
•! Since AR4, cap and trade systems for GHGs have been established in a number of countries and regions.
•! In some countries, tax-based policies specifically aimed at reducing GHG emissions–alongside technology and other policies–have helped to weaken the link between GHG emissions and GDP
•! The reduction of subsidies for GHG-related activities in various sectors can achieve emission reductions, depending on the social and economic context.
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Effective mitigation will not be achieved if individual agents advance their own interests independently. •! Existing and proposed international climate change cooperation
arrangements vary in their focus and degree of centralization and coordination.
•! Issues of equity, justice, and fairness arise with respect to mitigation and adaptation.
•! Climate policy may be informed by a consideration of a diverse array of risks and uncertainties, some of which are difficult to measure, notably events that are of low probability but which would have a significant impact if they occur.
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Mitigation can result in large co-benefits for human health and other societal goals.
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IPCC AR5 Synthesis Report
The Choices Humanity Makes Will Create Different Outcomes (and affect prospects for effective adaptation)
With substantial mitigation
Without additional mitigation
Change in average surface temperature (1986–2005 to 2081–2100) AR5 WGI SPM
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The Hidden IPCC Message:
• If it’s possible and not enough happens, what is lacking?
• Political will, at the appropriate scale
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Chamonix, June 2016
Jean-Pascal van Ypersele (@JPvanYpersele)
Acommonpurpose,coordination,cooperation,riskmanagement
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3j$
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Paris Agreement!
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Paris Agreement!
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67
Intended Nationally Determined Contributions!
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Baseline
(INDCs)
Unconditional INDCs case
Median estimate of level constant with 2°C
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Itrytobecoherent…
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Chamonix, June 2016
Jean-Pascal van Ypersele (@JPvanYpersele)
Effortsdeliver
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Chamonix, June 2016
Jean-Pascal van Ypersele (@JPvanYpersele)
TheskyisbluewhenabovethecloudswhichobscuretheSunforthosewhoremaininthevalley
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Chamonix, June 2016; The future is full of opportunities
Jean-Pascal van Ypersele (@JPvanYpersele)
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Jean-Pascal van Ypersele ([email protected])
Useful links: !! www.ipcc.ch : IPCC (reports and videos) !! www.climate.be/vanyp : my slides and other
documents !! www.skepticalscience.com: excellent responses to
contrarians arguments !! On Twitter: @JPvanYpersele and @IPCC_CH
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