Getting to carbon neutrality

November 27, 2009

in Canada, Economics, Politics, Science, The environment

Emissions pathways to give 75% chance of limiting global warming to 2ºC

Responding to an unusually poor article, written by Lorrie Goldstein and printed in the Toronto Sun, I wrote that: “If you want high human welfare and prosperity for decades and generations ahead, dealing with climate change is not optional. The longer Canada waits to begin the process of going carbon-neutral, the more costly and painful that process will be.”

The above graphic, included in the recent Copenhagen Diagnosis, illustrates this situation nicely. The graphic shows three different pathways, each of which would give humanity a 75% chance of limiting warming to 2°C – a target that has been widely endorsed by governments, including those of the UK and EU. In a scenario where global emissions peak in 2011, they would only need to fall to about 5 gigatonnes by 2050, a reduction rate of 3.7% per year. Waiting just four more years, and having them peak in 2015, increases that to 5.3% per year. In the scenario with the 2015 peak, humanity as a whole needs to be carbon neutral before 2050, in order to provide the 75% certainty of avoiding more than 2°C of warming. Waiting until 2020 means that emissions need to fall by 9% per year afterwards, with carbon neutrality reached around 2040.

Bear in mind that these are global pathways. Under a contraction and convergence approach, where countries cut emissions while simultaneously becoming more equal in terms of per capita emissions, Canada would need to cut even faster. This illustrates firstly how wrongheaded it is to hope for a few more years of a hydrocarbon boom before we start the process of adjustment. It also illustrates the urgency of getting an effective global agreement in place soon. This isn’t an issue on which we can simply doddle for a decade. If we don’t want to see our children living in a transformed world, humanity needs to act fast and on a massive scale.

On a personal level, this may also bring some clarity to the many discussions we’ve had here about carbon ethics. If we individually want to mirror what the world as a whole needs to do, we should be planning to have our personal emissions peak virtually instantly, and fall every year thereafter. People who are my age should be thinking seriously about the possibility of living carbon-neutral lives by the time they face retirement – and about what accomplishing that would require.

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{ 10 comments… read them below or add one }

Tristan November 27, 2009 at 12:01 pm
R.K. November 27, 2009 at 5:33 pm

If we individually want to mirror what the world as a whole needs to do, we should be planning to have our personal emissions peak virtually instantly, and fall every year thereafter.

As you said before, dealing with climate change is like changing the course of a huge cruise ship. What is important now is altering the overall direction, not changing the individual lifestyle choices of activists.

Besides, it is impossible for the world’s current six billion people to go carbon neutral without enormous changes in infrastructure.

R.K. November 27, 2009 at 5:34 pm

Those curves are still sobering, however. It doesn’t seem like anyone has the will to start on the first part of the green curve – and it is hard to imagine what the middle of the red curve would be like.

. December 16, 2009 at 10:27 am

“The problem is not a technological one. The human race has almost all the tools it needs to continue leading much the sort of life it has been enjoying without causing a net increase in greenhouse-gas concentrations in the atmosphere. Industrial and agricultural processes can be changed. Electricity can be produced by wind, sunlight, biomass or nuclear reactors, and cars can be powered by biofuels and electricity. Biofuel engines for aircraft still need some work before they are suitable for long-haul flights, but should be available soon.

It is all about politics. Climate change is the hardest political problem the world has ever had to deal with. It is a prisoner’s dilemma, a free-rider problem and the tragedy of the commons all rolled into one. At issue is the difficulty of allocating the cost of collective action and trusting other parties to bear their share of the burden. At a city, state and national level, institutions that can resolve such problems have been built up over the centuries. But climate change has been a worldwide worry for only a couple of decades. Mankind has no framework for it. The UN is a useful talking shop, but it does not get much done.

The problem will be solved only if the world economy moves from carbon-intensive to low-carbon—and, in the long term, to zero-carbon—products and processes. That requires businesses to change their investment patterns. And they will do so only if governments give them clear, consistent signals.”

. June 18, 2010 at 4:49 pm

Until Copenhagen, the aim was to set targets for major emitters of greenhouse gases that would limit warming to 2 °C. That required, as a first step, that by 2020 industrialised countries cut emissions by 25 to 40 per cent compared with 1990 levels.

While that target remains an option in draft deals, most negotiators say they will have to accept whatever pledges industrialised countries are prepared to make. Right now those pledges add up to cuts of between 12 and 19 per cent, according to the UN climate secretariat. And there are loopholes that could mean even these pledges amount to virtually nothing.

“As things stand now, we will not be able to halt the increase in global greenhouse gas emissions in the next 10 years,” UN chief negotiator Yvo de Boer said in Bonn. “The 2-degree world is in danger. The door to a 1.5-degree world is rapidly closing.” De Boer is stepping down at the end of this month, and his successor, Costa Rican diplomat Christiana Figueres, said her priority was “rebuilding trust” rather than setting objectives.”

. December 9, 2010 at 7:33 pm

The IEA also looked at what it might take to hit a two-degree target; the answer, says the agency’s chief economist, Fatih Birol, is “too good to be believed”. Every signatory of the Copenhagen accord would have to hit the top of its range of commitments. That would provide a worldwide rate of decarbonisation (reduction in carbon emitted per unit of GDP) twice as large in the decade to come as in the one just past: 2.8% a year, not 1.4%. Mr Birol notes that the highest annual rate on record is 2.5%, in the wake of the first oil shock.

But for the two-degree scenario 2.8% is just the beginning; from 2020 to 2035 the rate of decarbonisation needs to double again, to 5.5%. Though they are unwilling to say it in public, the sheer improbability of such success has led many climate scientists, campaigners and policymakers to conclude that, in the words of Bob Watson, once the head of the IPCC and now the chief scientist at Britain’s Department for Environment, Food and Rural Affairs, “Two degrees is a wishful dream.”

. December 19, 2010 at 7:50 pm

Climate pledges fall short, says UN
By Richard Black Environment correspondent, BBC News

The promises countries have made to control carbon emissions will see temperatures rise by up to 4C during this century, a UN report concludes.

The report, from the UN Environment Programme (Unep), comes days before the opening of this year’s climate summit.

It concludes there is a significant gap between what science says is necessary to constrain temperature rise and what governments have pledged to achieve.

But with extra political will, it says, warming could be kept much lower.

On Sunday, scientists released data showing that the recession curbed emissions from fossil-fuel burning by only 1.3% during 2009, and that they are set to begin rising again as the global economy cranks up once more.

Unep’s analysis shows that even if governments implement all they have pledged to do, that would “…imply a temperature increase of between 2.5-5C [from pre-industrial times] before the end of the century”.

Peer reviewed science! July 18, 2011 at 7:23 pm

Davis, S.J., K. Caldeira, and H.D. Matthews. 2010. Future CO2 emissions and climate change from existing energy infrastructure. Science 10 September, 2010 Vol 328 pp 1330-1333.

The long lifetime of existing transportation and energy infrastructure means that continued emissions of CO2 from these sources are likely for a number of decades. This ‘infrastructural inertia’ alone is projected to produce a warming commitment of 1.3°C above the pre-industrial era. This result emphasizes that extraordinary measures will be required to limit emissions from new energy and transportation sources if global temperature is to be stabilized below 2°C.

Climate modeling has demonstrated that even if atmospheric composition was fixed at current levels, continued warming of the climate would occur due to inertia in the climate system. This form of climate change commitment has become widely recognized. Davis et al. focus attention on inertia in human systems, by asking ‘what CO2 levels and global mean temperature would be attained if no additional CO2-emitting devices (e.g., power plants, motor vehicles) were built but all the existing CO2-emitting devices were allowed to live out their normal lifetimes?”. Barring widespread retrofitting or early decommissioning of existing infrastructure, these committed emissions represent ‘infrastructural inertia’. The authors developed scenarios of global CO2 emissions from existing infrastructure directly emitting CO2 to the atmosphere for the period 2010 to 2060 (with emissions approaching zero at the end of this time period) and used the University of Victoria Earth System Climate Model to project the resulting changes in atmospheric CO2 and global mean temperature. Projections with low, mid and high emissions scenarios led to projected global average warming of 1.3°C (1.1° to 1.4°C) above the pre-industrial era. Since new sources of CO2 are bound to be built in the future in order to satisfy growing demands for energy and transportation, the committed warming from existing infrastructure makes clear that satisfying these demands and achieving the 2°C target of the Copenhagen Accord will be an enormous challenge.

Summary courtesy of Environment Canada

. November 9, 2011 at 10:03 am
. May 14, 2012 at 8:39 pm

In engagements with young people in particular, I like to introduce the notion that, “We are the U-turn Generation.” The concept is this: all of us who have the courage to look the science of global warming full-on wrestle with despair. A clear understanding of what the scientific studies are telling us is that wealthy industrialized societies must be carbon-zero by 2050. Even then, we will still face the challenge of pulling accumulated GHGs out of the atmosphere, in order to get global CO2 parts per million (PPM) down to 350, if devastating ecological and social upheaval and harm is to be avoided. We are forced to live with the uncertainty of whether this Herculean global task can be accomplished. But for now, the task of this generation is the U-turn ­­– to change the direction of the path we are on – to see global emissions slow, and over the next 30-40 years, drop to zero.

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