Contraction and convergence is the idea of equal carbon emissions per person, wherever they live in the world.
- Under "C&C", all countries would agree a target for a stable amount of carbon dioxide in the atmosphere, say, 450 parts per million.
- A "global emissions budget" would be calculated, derived from the target figure.
- The atmospheric concentration target would be reviewed annually so that it could be revised with new scientific findings.
- Developing countries would be allowed to increase their emissions per capita while industrialised nations cut theirs, until both sides reach the same level.
Last week, the chancellor of Germany, Angela Merkel, came out in support of C&C.
Over to you, Gordon.
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