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Contraction and Convergence (C&C) is a proposed global framework for reducing greenhouse gas emissions to combat climate change. Conceived by the Global Commons Institute (GCI) in the early 1990s, the Contraction and Convergence strategy consists of reducing overall emissions of greenhouse gases to a safe level (contraction), resulting from every country bringing its emissions per capita to a level which is equal for all countries (convergence).

It is intended to form the basis of an international agreement which will reduce carbon dioxide emissions to avoid dangerous climate change, carbon dioxide being one of the most significant gases responsible for the greenhouse effect on Earth.[1]

It is expressed as a simple mathematical formula. This formula can be used as a way for the world to stabilize carbon levels at any level. Advocates of Contraction and Convergence stress that negotiations at the United Nations Framework Convention on Climate Change (UNFCCC) are governed sequentially by the 'objective' of the UNFCCC (safe and stable GHG concentration in the global atmosphere) followed by its organising principles ('precaution' and 'equity'). C&C is widely cited and supported.[2] The C&C calculus is now embedded in Domain Two of GCI's Carbon Budget Accounting Tool.[3]

  1. ^ Change, NASA Global Climate. "Carbon Dioxide Concentration | NASA Global Climate Change". Climate Change: Vital Signs of the Planet. Retrieved 2023-05-20.
  2. ^ "Contraction and Convergence Endorsements". Archived from the original on 2020-04-05. Retrieved 2014-12-24.
  3. ^ "CBAT". Archived from the original on 2017-11-15. Retrieved 2017-09-23.

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Contraction and Convergence

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Contraction and Convergence (C&C) is a proposed global framework for reducing greenhouse gas emissions to combat climate change. Conceived by the Global...

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Aubrey Meyer

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University. "It seems to me that Contraction and Convergence is the basic principle that should guide climate policy, and that this policy is really unchallenged...

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Contraction mapping

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x_{n+1}=f(x_{n})} yields convergence to a fixed point x n → z ∈ Fix f {\displaystyle x_{n}\to z\in {\text{Fix}}f} . This convergence might be weak in an...

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Accommodation reflex

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accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa)...

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Convergence proof techniques

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necessary conditions and generalizations to more abstract settings. The convergence of series is already covered in the article on convergence tests. It is common...

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Vena contracta

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into a pipe, or a sudden contraction in pipe diameter. Streamlines will converge just downstream of the diameter change, and a region of separated flow...

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Intertropical Convergence Zone

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in the 1940s and the 1950s of the significance of wind field convergence in tropical weather production, the term Intertropical Convergence Zone (ITCZ)...

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International Carbon Reduction and Offset Alliance

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conduct for the majority of criteria." Carbon emission trading Contraction and Convergence Murphy, Mathew (9 June 2008). "New international standards organisation...

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Cap and Share

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be an unrealistic approach. Cap and Share is partly an extension and popularisation of the Contraction and Convergence proposal developed by the Global...

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Global Commons Institute

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Aubrey Meyer and others to campaign for a fair way to tackle climate change. It has in particular promoted the model of Contraction and Convergence of CO2 emissions...

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Global climate regime

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Proposals for a global climate regime include: Contraction and Convergence Greenhouse Development Rights Cap and Share Nishimura's proposal of a global upstream...

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Environmental policy

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Aubrey Meyer calls for a 'framework-based market' of Contraction and Convergence. The Cap and Share and the Sky Trust are proposals based on the idea. In...

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Index of climate change articles

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feedback - Cloud reflectivity enhancement - Coal phase out - Contraction and Convergence - Contrail - Cool roof - Cool tropics paradox - Coral bleaching...

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Skeletal muscle

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the muscle fiber necessary for muscle contraction. Muscles are predominantly powered by the oxidation of fats and carbohydrates, but anaerobic chemical...

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Richard Douthwaite

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(London) from 1993 to 2005 during which time GCI developed the "contraction and convergence" approach to dealing with greenhouse gas emissions which has...

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Climate Stewardship Acts

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gradually reduced, following the theory of contraction and convergence. It was co-sponsored by eleven senators and also received endorsements from the National...

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List of flexors of the human body

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hand closer to the shoulder. Flexion is typically instigated by muscle contraction of a flexor. of the humerus bone (the bone in the upper arm) at the shoulder...

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Personal carbon trading

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footprint Clean Air Conservancy Contraction and Convergence Emissions Reduction Currency System International Carbon Reduction and Offset Alliance Personal carbon...

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Abducens nucleus

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located in the abducens nucleus: motorneurons and interneurons. The former directly drive the contraction of the ipsilateral lateral rectus muscle via...

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Multimodality

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Communication is spread across a medium through content convergence, such as a blog post accompanied by images and an embedded video. This idea of combining mediums...

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Lactiferous duct

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hormones, the milk is moved to the nipple by the action of smooth muscle contractions along the ductal system to the tip of the nipple. They are also referred...

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Adrenergic receptor

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smooth muscle contraction. The β receptor couples to Gs and increases intracellular cAMP activity, resulting in e.g. heart muscle contraction, smooth muscle...

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Renal calyx

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calyces. This causes them to fire impulses which stimulate rhythmical contraction and relaxation, called peristalsis. Parasympathetic innervation enhances...

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The Big Bang Theory season 5

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Friendship Contraction" and "The Countdown Reflection". Stephen Hawking went on to appear in the season 6 episode "The Extract Obliteration" and the season...

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