Several charts produced by the Global Commons Institute vividly demonstrate the woeful inadequacy of both the US federal government’s and US states’ commitments on climate change in light of the most recent climate change science.

These charts are extremely important because there is virtually no discussion in the US press of the utter and undeniable inadequacy of commitments on climate change made by the US federal and state governments.

These charts help visualize complex information that is not well understood by the vast majority of US citizens, yet these facts  must be understood to comprehend the utter inadequacy of the US federal government and US state governments response to climate change. Thus, these charts help explain both why the US commitment to reduce its ghg emissions by 17% below 2005 as well as targets that have been set by even those US states which have shown some leadership on climate change must now be understood as utterly inadequate in light of the most recent climate change  science.

As we shall see below, in setting a government target for ghg emissions two clusters of issues need to be considered which have largely been ignored when US policy makers have set ghg emissions targets. One is the issue of global carbon budgets for the entire world needed to prevent dangerous climate change. We will call this the carbon budget issue. The second is the unquestionable need of all governments to set a target in light of that government’s fair share of safe global emissions. This is required by distributive justice. We will call this the equity or justice issue. All ghg emissions targets are implicitly a positions on the carbon budget issue and the equity and justice issue, yet policy makers rarely discuss their implicit positions on these issues and the US media is largely not covering the budget and justice issues implicit in any US policy on climate change. Any entities identifying a ghg emissions reduction target must be expected to expressly identify their assumptions about what remaining carbon budget and justice and equity consideration were made in setting the target.

I. The First Chart-US States’ Emissions Reductions Commitments Required to Prevent Dangerous Climate Change and Adjusted  To Take Equity Into Account.

The following chart depicts what US states emissions commitments should be to prevent dangerous climate change in light of the most recent climate change science and the need to take justice into account in setting ghg emissions targets. This chart can be examined in more detail on the Global Commons Institute website at http://www.gci.org.uk/images/Don_Brown_All_State_draft_[complete].pdf Clinking on this URL should access a pdf file that will allow for a closer inspection of this chart which can  be further enhanced by using the zoom function.

What is most notable about this chart is that the US federal government and US state g0vernments will need to reduce their ghg emissions extraordinarily steeply in the next few decades, far beyond what has been committed to.  This chart, in combination with the next chart, helps visualize why the current commitments of even those US states which have demonstrated some considerable leadership on climate change need to be increased to levels that represent the state’s  fair share of safe global emissions.

a. The Carbon Budget Issue

These steep reductions commitments are needed in light of the most recent scientific understanding of the climate problem facing the world. A carbon emissions budget for the entire world is needed to prevent dangerous climate change and was identified by IPCC in 2013. This budget is of profound significance for national and state and regional ghg emissions reductions targets yet it is infrequently being discussed in global media and has virtually been completely ignored by the US media. To give the world an approximately 66% chance of keeping warming below 2 degrees C, the entire global community must work together to keep global ghg emissions from exceeding approximately 250 metric gigatons of carbon dioxide equivalent. The 250 metric gigatonne budget figure has been widely recognized as a reasonable budget goal by many scientists and organizations including most recently the International Geosphere Biosphere Program. The 250 metric ton number is based upon IPCC’s original budget number after adjusting for carbon equivalence of non-CO2 gases that have already been emitted but were not considered initially by IPCC. The practical meaning of this budget is that when the 250 gigtatons of carbon dioxide equivalent emissions have been emitted the entire world’s ghg emissions must be zero to give reasonable hope of limiting warming to the 2 degrees C. Since the world is now emitting carbon dioxide equivalent emissions at approximately 10 metric gigatons per year, the world will run out of emissions under the budget in approximately 25 years at current emissions rates. This is a daunting challenge for the world particularly in light of the fact that global emissions levels continue to increase.

A 2 degree C warming limit was agreed to by almost every nation in the world in international climate change negotiations in 2009 in Copenhagen because it is widely believed by the majority of  mainstream scientists that warming greater 2 degree C will create very harsh climate impacts for the world. In fact many scientists believe that the warming limit should be lower than 2 degree C to prevent dangerous climate change and as a result the international community has also agreed to study whether the warming limit should be lowered to 1.5 degree C. The report on whether a 1.5 degree C  warming limit should be adopted  is to be completed in 2015. In addition, some scientists, including former NASA scientist James Hansen who is now at Columbia University, believe that atmospheric concentrations are already too high and that atmospheric concentrations of ghg should actually be lowered from their current levels of approximately 400 ppm CO2 to 350 ppm CO2 to prevent dangerous climate impacts. If, of course, there is a consensus that the current warming limit should be lower than 2 degrees C, the slopes in the above chart would need to be even steeper.  (For a good introduction to the implications of the 2 degree C warming limit see the short video by International Geosphere Biosphere Programme)

Although there has been some very limited discussion of this in the US press, the staggering global challenge entailed by keeping global emission within a roughly 250  gigaton budget, not to mention a budget premised on 1.5 degrees C,  does not take into account the additional undeniable need of  high-emitting nations, states, and regional governments to take equity and distributive justice into account in setting ghg emissions reduction targets is not being covered in US media hardly at all.

b. The Justice or Equity Issue

Under any reasonable interpretation of what equity and justice requires, high-emitting nations and regions (including the United States federal government and US states) will need to reduce their ghg emissions at significantly greater rates than lower emitting government entities because of: (1) significantly higher per capita emissions in developed nations (2) the dramatically higher historical emissions of most developed countries compared to poorer countries, and (3) the need of poor countries to be able to aspire to economic growth rate that will get them out of grinding poverty. If equity is not taken into account in setting national ghg targets, poor countries will have their much lower per capita emissions levels frozen into place if national governments set targets based upon equal percentage reduction amounts. And so there are at least three very strong reasons why any target of a high emitting nation or state government must take justice into account in setting its emissions reduction target:

(1) Allocating emissions among nations to achieve a global target is inherently a problem of distributive justice. To not take justice into account in quantifying ghg emissions targets guarantees an unjust global response to climate change.

(2) All nations including the United States have already agreed to reduce their emissions based upon “equity,” not national self-interest when they ratified the United Nation Framework Convention on Climate Change.

(3) To not consider justice when a developed nation sets a ghg reduction target would be extraordinarily and obviously unfair to poor, low emitting nations, many of which are most vulnerable to the harshest climate change impacts and have done little to cause the existing problem.

The numbers in the above chart are based upon an equity framework known as Contraction and Convergence (C&C).  The C&C framework consists of reducing overall emissions of ghg to a safe levels from all nations (contraction) and each nation bringing its emissions eventually to equal per capita levels for all countries (convergence). Although justification of the C&C framework is beyond the scope of this entry, we will argue in a future article that it is the least controversial of all of the equity frameworks receiving international attention and therefore should be adopted by the international community as it can be adjusted to take other distributive justice issues into account not expressly initially considered in the C&C framework such as historical emissions and the need of poor-developing countries to grow economically. Because nations can negotiate the convergence date in the C&C framework, it is also a good tool to negotiate a global solution to climate change. It is therefore the least controversial of all of the equity frameworks under serious consideration by the international community although there are other equity frameworks that have some supporters including the Greenhouse Development Rights Framework (GDR). (We will explain our position on these issues in much more detail in a future entry.)

Yet, for the purposes of showing the utter inadequacy of existing US federal government and US state commitments, the C&C framework is very useful because other equity frameworks which have received some attention and respect in international discussions of what equity requires of nations would require even steeper reductions for the US and US state governments. For instance the GDR framework would require the US to be carbon negative by between 2025 and 2030. The C&C framework is therefore a very non-controversial way of demonstrating the utter inadequacy of developed nations ghg emissions reductions commitments because other equity frameworks would require even greater reductions from developed countries.

The above  chart demonstrates the implications of this recent science for US states as well as the inadequacy of the US federal government commitment in light of a total global budget limitation of approximately 250 gigatons of carbon equivalent emissions.. The steepness of the curves in this chart are driven both by the limitations of the 250 gigaton carbon equivalent budget and the need to take equity into account. (The Global Commons Institute has  a computer graphic tool on its web site, the Carbon Budget Accounting Tool, that allows those who would like to consider alternatives to the 250 gigaton budget to visualize the effects of other budget numbers on the shape of the ghg  reductions pathways needed, the differences in environmental impacts, and  many other policy considerations.)

Like any attempt to determine what a ghg national target should be, the above  chart makes a few assumptions, including but not limited to, about what equity requires not only of the United States but of individual states, when global emissions will peak, and what the carbon emissions budget should be to avoid dangerous climate change. Although different assumptions would lead to different slopes of the emissions reductions pathways that are needed to remain below the 250 gigaton global carbon limitation, the chart depicts very reasonable assumptions about what needs to be done to stay within the 250 gigaton carbon equivalent budget while taking equity into account. And so, without doubt the US government and US state’s targets are woefully inadequate. To stay within the 250 gigaton carbon equivalent budget, total US emissions which will be comprised of emissions from all states must achieve carbon neutrality by 2050. Even the most aggressive US state targets are woefully short of this goal. In addition most US states have no emissions reduction target at all. The US will need to achieve carbon neutrality by 2050, and this national requirement will will require US states to work together to achieve carbon neutrality. The US government could achieve the goal of reaching carbon neutrality by 2050 by relying on different approaches in different states, yet the individual states must assume they have a duty to limit their ghg emissions to levels that constitute their fair share of safe global emissions and in the absence of a federal plan that would allow them to do otherwise, states must achieve zero carbon emissions by 2050 and the above chart is a good example of what is required of them in total.

 II. The Second Chart-US States Existing Commitments Compared to an 80% Reduction By 2050. 

A few states have set ghg emissions reduction targets of 80 %  by 2050. The next chart shows the quantify of reductions that each state would need to achieve to reach an 80% reduction by 2050 although we have already established above that the most recent science would require each state to achieve carbon neutrality by 2o50.

This chart can be examined in higher resolution on the Global Commons Institute website at: http://www.gci.org.uk/images/Emissions_Cuts_States_by_State.pdf

What is notable about this chart is that most US states have made no ghg emissions reductions commitments at all, only a few have made a commitment of an 80% reduction by 2050 which is still not stringent enough to meet the goal of carbon neutrality by 2050, and that some states such as Texas need to achievehuge emissions reductions if the US is going to do its fair share of staying within the 250 metric gigaton carbon equivalent budget.

III. Conclusions

These charts help visualize the enormity of the challenge facing the United States federal government and US state governments in light of the challenge facing the world as understood by the vast majority of mainstream scientists. There has been almost no coverage of this reality in the US media.

As explained above, there are two kinds of issues that need to be understood to comprehend what governments must do when setting ghg emissions targets. The first is the need to set any target in light of a total global ghg emissions limitation or budget entailed by the need to limit ghg emissions to levels that will not cause dangerous climate change. This, as we have seen,  is sometimes referred to as the carbon budget issue. The second is the need of governments to set their emissions target only after considering what distributive justice requires of them. This sometimes referred to as the equity or justice issue.  Any propose ghg emissions target must take positions on

these two clusters of issues in fact they implicitly do this. Yet government rarely explain what assumptions about the carbon budget and equity and justice issues they have made when setting their target.

By:

Donald A. Brown

Scholar In Residence and Professor,Sustainability Ethics and Law
Widener University School of Law

Part-time Professor, Nanjing University of Science and Technology, Nanjing China

dabrown57@gmail.com