23rd august 2012 prof. johan rockström stockholm resilience centre stockholm environment institute...
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23rd August 2012 Prof. Johan RockströmStockholm Resilience Centre
Stockholm Environment Institute
Planetary boundaries and global sustainability
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1920 1960 2000 2040 2080
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Future Earth research for global sustainability
photos: www.dawide.com
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Ban Ki-moon High-Level Panel on Global Sustainability
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Rio+20 and Planetary Boundaries
UN Secretary General Ban Ki-Moon High Level Panel on Global Sustainability
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Walker, B. et al., 2009. Science, 325: 1345-1346
Looming global scale failures and missing institutions
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Humanity’s 10,000 years of grace
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(Hansen and Sato, 2011)
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Planetary Boundaries: Exploring the safe operating space for humanity in the Anthropocene (Nature, 461 : 472 – 475, Sept 24 - 2009)
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From: ”Limits to growth””Carrying capacity””Guardrails” ”Tipping Elements”
To: ”Planetary Boundaries”
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Climate Change< 350 ppm CO2 < 1W m2
(350 – 500 ppm CO2 ; 1-1.5 W m2)
Ocean acidificationAragonite saturation
ratio > 80 % above pre-industrial levels
(> 80% - > 70 %)
Ozone depletion< 5 % of Pre-Industrial 290 DU
(5 - 10%)
Global Freshwater Use<4000 km3/yr
(4000 – 6000 km3/yr)
Rate of Biodiversity Loss
< 10 E/MSY(< 10 - < 1000 E/MSY)
Biogeochemical loading: Global N & P Cycles Limit industrial
fixation of N2 to 35 Tg N yr-1(25 % of natural fixation)
(25%-35%)P < 10× natural
weathering inflow to Oceans
(10× – 100×)
Atmospheric Aerosol Loading To be determined
Land System Change
≤15 % of land under crops
(15-20%)
Chemical Pollution Plastics, Endocrine Desruptors, Nuclear Waste Emitted globally
To be determined
Planetary Boundaries
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…
Rockström et al. 2009 Nature, 461 (24): 472-475
Global fresh-water use
Transgressing safe boundaries
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350 550
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Adapted from Canadell et al., 2007
0123456789
10
Resilience of the Earth system
Gt
Carb
on
/yr
land
ocean
atmosphere
Interactions among Planetary Boundaries
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Global emission pathways in compliance with a 2 ºC guardrail
(WBGU 2009)
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Submitted to PNAS August 2012
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Submitted to Geophysical Research Letters (August 2012)
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Analyzing the Concept of Planetary Boundaries from a Strategic Sustainability
Perspective:
- How do we avoid tipping the planet -
Karl-Henrik Robèrt1,, Göran Broman1 and George Basile2
In Review, Ecology and Society, July 2012
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1. Stay within 350 ppm, an agricultural system that goes from being a source to a global sink
2. Essentially a green revolution on current cropland (expansion from 12 % to 15 %)
3. Keep global consumptive use of blue water < 4000 km3/yr, we are at 2,600 km3/yr today and rushing fast towards 4000 km3/yr
4. Reduce to 25 % of current N extraction from atmosphere
5. Not increase P inflow to oceans 6. Reduce loss of biodiversity to < 10 E/MSY from
current 100-1000 E/MSY
A new ”global spec” for world food production
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Planetary Boundaries 2.0 Interactions and feedbacks (integated Earth system
modelling) Feeding the world within planetary boundaries Earth system governance and planetary boundaries Down-scaling (Baltic Sea) Planetary boundaries and SDGs Integating biophysical and social planetary
boundaries
Directions of Future Research