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IGBP Climate-Change Index was launched in Copenhagen, 9 December 2009, in order to help communicate global-change trends for the public and policymakers.
It brings together key indicators of global change: carbon dioxide, temperature, sea level and sea ice. The index gives an annual snapshot of how the planet’s complex systems – the ice, the oceans, the land surface and the atmosphere – are responding to the changing climate. The index rises steadily from 1980 – the earliest date the index has been calculated. The change is unequivocal, it is global, and, significantly, it is in one direction. The reason for concern becomes clear: in just 30 years we are witnessing major planetary-scale changes.
The index dips in just three years, 1982, 1992 and 1996 and looks effective at capturing major natural events that affect climate, and their knock-on effect on the planet.
The index has been developed with input from a large number of scientists involved in global-change research.

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