Pledge and review

Pledge and review is a method for facilitating international action against climate change. It involves nations each making a self-determined pledge relating to actions they expect to take in response to global warming, which they submit to the United Nations. Some time after the pledges have been submitted, there is a review process where nations assess each other's progress towards meeting the pledges. Then a further round of enhanced pledges can be made, and the process can further iterate.
"Pledge and review" is sometimes referred to as a bargaining approach; when nations first announce their pledges they may not be set in stone. A nation might strengthen its pledge in response to pledges by its competitors, which can encourage it to increase its climate ambition if it feels it can do so without losing ground to trading rivals. Additionally, sometimes a nation that feels especially threatened by climate change can make non-climate related concessions to a trading partner, in return for them making a stronger pledge. The main way to increase pledges, however, is when the process iterates after the review phase. Each subsequent round of pledges is supposed to be involve an increased level of commitment to combat climate change. Hence the ratcheting up metaphor is often used, as the strengthening of pledges is supposed to be a one-way process.
Pledge and review was introduced as a possible way to facilitate global action on climate change in 1991. It was little used, however, and rejected by the international community in 1995, in favour of aiming for legally binding emission reduction targets. Due to challenges in securing international agreement to strengthen the only partially successful Kyoto Protocol, pledge and review was re-introduced as part of the 2009 Copenhagen Accord. Initially seen as an interim measure, it has become a central approach of international efforts to encourage climate mitigation. Though in negotiations leading to the Paris Agreement, the name pledge and review was dropped; pledges are now formally called Nationally Determined Contributions.
History.
The "pledge and review" system was first proposed by Japan in 1991. In December 1990, in response to the threat of climate change, the United Nations established the Intergovernmental Negotiating Committee for a Framework Convention on Climate Change. It had become apparent that getting nations to commit to legally binding emissions targets would be more challenging for greenhouse gas emissions (GHG) than it had been for emissions relating to sulphur pollution and depletion of the ozone layer. With the support of Britain and France, Japan made a proposal for a pledge and review system as an alternative. Various nations objected to the idea, however, so only a weakened form of pledge and review was included in the United Nations Framework Convention on Climate Change (UNFCCC) by the time it was signed at the 1992 Earth Summit. The pledge and review system was formally rejected at the which took place in Berlin, 1995. The focus switched to negotiations aimed at legally binding emission reduction targets, as embodied by the 1997 Kyoto Protocol.
The Kyoto protocol has only aimed to impose emissions reduction targets on Annex 1 parties (largely corresponding to advanced industrialised nations as of the late 20th century, plus some of the economies in transition). The non-Annex countries, including large emitters such as China, did not have targets at all. Even the Annex 1 countries did not all accept the reduction targets, most notably the United States. At the 2009 Copenhagen Summit, the main focus was on strengthening the emission reduction targets. This failed. As a backstop measure, a revival of the voluntary pledge and review system was proposed by Australia. 89 countries submitted such a pledge (including the 27 EU member states who issued a combined pledge). 47 of these nations were non-Annex countries. The nations which had made a Copenhagen pledge were collectively responsible for about 80% of global GHG emissions, much more than the 25% covered by Kyoto targets in the or the 15% covered by the commitment period later agreed at the 2012 Doha summit.
The pledge and review system established at Copenhagen was formalised at the 2010 Cancún Summit. The system was further strengthened in the years leading up to the 2015 Paris Conference, though it was no longer called "pledge and review", with pledges instead formally labelled Nationally Determined Contributions (NDCs).
Mechanism.
Pledges.
The expected content for pledges depends on the specific implementation of pledge and review. Commitments to GHG emissions reduction targets are generally a core feature, though states have full freedom to set where that target lies. States can choose to express their reductions target in different ways. For example, in terms of absolute reductions in the volume of GHG emitted; for the Paris implementation, most developed nations included such a pledge. Yet states can instead commit to reducing GHG emissions in other ways, such as a percentage of GDP growth. As well as emissions reductions targets, the pledges can include intentions to implement climate adaptation measures, as well as specific industry level climate friendly policy, like support for various types of sustainable energy production. States are never legally required to meet the commitments in their pledges, but their progress is subject to review.
Reviews.
The exact mechanism for reviews also varies depending on the specific implementation, and the review concept applies at several levels. Nations periodically review their own pledges, with a view to a one way increase in ambition. Pledges, both the level of commitment they contain, and actual progress in achieving the same, are also reviewed internationally, under the auspices of the UNFCCC. While the formal review processes run by the United Nations aim to be non adversarial, states can also be subject to informal reviews from NGOs, which can take a name and shame approach, though may also choose to "praise and encourage" nations that are doing more than comparable peers to limit climate change. In the implementation of pledge and review agreed at Paris in 2015, another level of review is the Global stocktake, where the pledges made by the world's nations are evaluated collectively.
Comparison with other methods for mitigating climate change.
There are three broad approaches to emissions reduction that nations can attempt to negotiate at international conferences. Setting a carbon price. The acceptance of legally binding emissions reductions targets imposed in a "top down" way by a central body such a United Nations agency. And the "bottom up" pledge and review system where each party autonomously decides its own contribution. These approaches are largely complementary, though at various conferences much of the focus has often been on a single approach. Until about 2010, international negotiations focused largely on emissions targets. Previous environmental successes like the reduction of emissions causing acid rain, and especially the Montreal treaty which led to reduced emissions damaging the ozone layer, suggested that targets could be effective. In practice however, it has been much more challenging to get nations to agree to binding targets relating to GHG. And even when they had signed up to a legally binding target, there is no reliable way to enforce such international law on a powerful nation. So after the relative failure of the Kyoto protocol and attempts to establish a more effective set of targets at Copenhagen, the pledge and review system became the dominant approach. As of 2020, international efforts to improve carbon price related mechanisms are still underway. Except at regional level in the EU, actual implementations have so far mostly occurred only at national and sub-national levels (e.g. in China, or in some U.S. states).
Criticism.
In the early 1990s, the pledge and review system was heavily criticised by environmental groups; for example, Climate Action Network labelled it "hedge and retreat". It has also been criticised by academics, especially after the system was revived at Copenhagen with some calling it "scientifically inadequate" or "second best". However, other academics described pledge and review as an "essential pillar for climate change mitigation". A survey of participants at the 2011 Durban summit found that the biggest concern over pledge and review was the gap between what has been pledged and the level of action needed to meet the 2 degree target (limiting global warming to only 2 °C above pre industrial temperatures.). Participants were least concerned about the voluntary nature of the pledges, suggesting that a system that lacked legally binding commitments could still have international legitimacy. Comparing NGOs with actual negotiators, the study found that in the case of Annex 1 NGOs, they were much more critical of NGOs than negotiators from Annex 1 nations. Whereas with non Annex 1 NGOs (mostly those based in the global south), they were less critical about pledge and review compared to negotiators.