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Contraction & Convergence (C&C) is the name of a Global CO2 emissions management model.

C&C was created by the Global Commons Institute (GCI) between 1989 & 1994.
GCI introduced C&C model at COP-2 in Geneva in 1996. In principle it was agreed at COP-3 in 1997.

As Joke Waller Hunter said after becoming the 2nd UNFCCC Executive Secretary in 2002 & the UNFCCC
repeated at COP-9 in Milan, "UNFCCC-compliance inevitably requires contraction and convergence".

C&C is also called 'The Well Tempered Climate Accord' (WTCA) as the internally convergent-parts of C&C
always add up to or commute with the global contraction-event as a whole required for UNFCCC-compliance.

GCI declared a global climate emergency at COP-2 as rates of climate change already threatened extinction.
Unless we complete a C&C-event at rates that avoid that threat, the reality of it will grow to overwhelm us.

Clearly what was already an emergency in 1996 has worsened. In 2019 it is now a crisis that many describe,
(with increasingly good reason from a 'human and a non-human perpective') as "an existential threat."

Some links to further information are here

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