What is a safe level of carbon in the atmosphere?

In order to restore the Arctic summer sea-ice on a long-term basis, atmospheric carbon dioxide levels must be reduced from present levels of roughly 400 parts per million to 300 - 325 parts per million, according to a research team led by leading climate scientist James Hansen. Hansen has proposed an initial target of 350 ppm, to be reassessed at a later date.

To fully restore a safe climate, atmospheric carbon dioxide levels may ultimately need to be returned to the preindustrial level of approximately 280 parts per million, according to the renowned climate scientist Hans Joachim Schellnhuber.

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