Presentation on theme: "Kevin Anderson Research director Tyndall Centre University of Manchester November 2008 Reframing Climate Change: Based on research by Kevin Anderson &"— Presentation transcript:
Kevin Anderson Research director Tyndall Centre University of Manchester November 2008 Reframing Climate Change: Based on research by Kevin Anderson & Alice Bows Mechanical, Aerospace and Civil Engineering How recent emission trends & the latest science change the debate
Talk outline 1) What is dangerous climate change? 2) Reframing the debate - cumulative emissions 3) Global greenhouse gas emission pathways 4) UK greenhouse gas emission pathways
What is dangerous climate change? UK & EU define this as 2 C
What are the ‘correct’ emission-reduction targets for 2 C ? UK, EU & Global - long term reduction targets - UK’s 60% reduction in CO 2 by 2050 - EU 60%-80% reduction in CO 2 e by 2050 - Bali 50% global reduction in CO 2 e by 2050 But CO 2 stays in atmosphere for 100+ years Hence, today’s emissions add to yesterdays & will be added to by tomorrows So, focus on long-term targets is very misleading
the final % reduction in carbon has little relevance to avoiding dangerous climate change (e.g. 2 C) Put bluntly … What is important are the cumulative emissions of carbon & other greenhouse gases (i.e. the carbon budget)
How do global temperatures link to global and national carbon budgets & from there to emission-reduction pathways?
Temperature threshold GHG concentration Global cumulative emission budget National cumulative emission budget Apportionment regime science/modelling Global emission pathway National emission pathway 2000-2008 emissions + short-term projections
available carbon budget 200020202040206020802100 Annual CO 2 e emissions
available carbon budget 200020202040206020802100 Annual CO 2 e emissions Illustrative pathway for a CO 2 e budget Plot recent emissions
available carbon budget 200020202040206020802100 Annual CO 2 e emissions Illustrative pathway for a CO 2 e budget Emissions already released
available carbon budget 200020202040206020802100 Annual CO 2 e emissions Illustrative pathway for a CO 2 e budget Emissions already released We can project: - Short-term emissions to peak year/s We know: - Cumulative emissions for 2°C
available carbon budget 200020202040206020802100 Annual CO 2 e emissions Illustrative pathway for a CO 2 e budget Emissions already released Hence can draw emission pathways
carbon budget range 200020202040206020802100 Annual CO 2 e emissions Illustrative pathway for a CO 2 e budget Emissions already released
How does this ‘scientifically-credible’ way of thinking alter the challenge we face at: 1) the global level 2) the UK level
What are the latest CO 2 emission trends? What are implications of factoring in: - land-use & forestry? - non-CO 2 greenhouse gas emissions? When will global CO 2 e emissions peak? Tyndall’s ‘global emission scenarios (CO 2 e)’
~ 2.7% p.a. last 100yrs ~ 3.3% p.a. in last 5 years What are the latest global CO 2 emission trends?
What are the latest global CO 2 e emission trends? ~ 2.8% p.a. since 2000 ~ Stern assumed 0.96%
Trajectory of Global Fossil Fuel Emissions Raupach et al. 2007, PNAS SRES (2000) growth rates in % y -1 for 2000-2010: A1B: 2.42 A1FI: 2.71 A1T: 1.63 A2: 2.13 B1: 1.79 B2: 1.61 Observed 2000-2006 3.3% 2006 2005
Emissions of CO 2 from land-use change -Characterised by high uncertainty (principally driven by deforestation) -Represents 12%-25% of total global greenhouse gas emissions in 2000 -Two Tyndall scenarios with different carbon-stock levels remaining: 70% & 80% -Optimistic compared with Forest Resource Assessment
Emissions of non-CO 2 greenhouse gases -Short-term EPA estimates -Characterised by considerable tail due to emissions associated with food production -Represents ~20-23% of total global greenhouse gas emissions in 2000 -Three scenarios with different peak dates
Bush - USA-2025 Stern – Global aim-2015 Tyndall-2015, 2020, 2025 Suggested CO 2 e emissions peak?
2°C greenhouse gas emission pathways (450ppmv CO 2 e)
For 2°C, emissions between 2000-2100 (the carbon budget) are estimated to be ~ 1400 to 2200 GtCO 2 e
Total greenhouse gas emission pathways 2015 peak 2020 peak2025 peak (Anderson & Bows. 2008 Philosophical Transactions A of the Royal Society. 366. pp.3863-3882)
What does all this imply for a 450ppmvCO 2 e future? Unprecedented annual reductions (~10% pa globally, even for 2020 peak)
3°C & 4°C greenhouse gas emission pathways (550 & 650 ppmv CO 2 e)
For 3°C (550ppmv CO 2 e) with emissions peaking by 2020: 6% annual reductions in CO 2 e 9% annual reductions in CO 2 from energy For 4°C (650ppmv CO 2 e) with emissions peaking by 2020: 3% annual reductions in CO 2 e 3.5% annual reductions in CO 2 from energy
Annual reductions of greater than 1% p.a. have only “been associated with economic recession or upheaval” Stern 2006 UK gas & French 40x nuclear ~1% p.a. reductions (ex. aviation & shipping) Collapse Soviet Union economy ~5% p.a. reductions What are the precedents for such reductions?
Even assuming: … an unprecedented step change in mitigating emissions … stabilising at 650ppmv CO 2 e appears increasingly to be the best we can expect i.e. human-induced climate change of ~4°C or more So where does this leave us?
We need to urgently reframe the climate change debate: For mitigation 2°C should remain the driver of policy For adaptation 4°C should become the driver of policy Consequently …
the UK level (older work based on CO 2 only - to be updated)
~ 17-23 GtCO 2 between 2000-2050 the UK’s budget is For a reasonable chance of 2°C to 3°C
1.What are the emissions between 2000 & today? 2.What emissions are we locked into in the immediate future? From this two questions arise
… emissions between 2000-2006 were ~ 4.5 billion tonnes of CO 2 … i.e. we’ve used ~¼ of our permitted emissions for 50 years in around 6 years Answer 1
Fuel Production, Extraction &Transport Powerstation Transmission Electricity Consumption Light 105054120133 the example of domestic lighting
… ultimately.. “at every level the greatest obstacle to transforming the world is that we lack the clarity and imagination to conceive that it could be different.” Roberto Unger
1-person living in 3 bedroom housespatio heaters10 halogen bulbs lighting the kitchen3 tonne 4WD car to transport 70kg flesh 3milesdriving children to school business tycoons with private jets academics flying to climate change conferencesmusicians flying to climate change concerts celebrating the excesses of celebrities ‘right’ to fly & drive when & to wherever we want year-round strawberries hen parties in Prague & birthdays in Barcelona double door refrigerators & home cinema second homes, 2 cars & 3 TVs & all with 9 billion people living on our planet!
End Reframing Climate Change: Kevin Anderson & Alice Bows Tyndall Centre University of Manchester How recent emission trends & the latest science change the debate