There is now clear evidence that changes in the Earth's climate may be sudden rather than gradual. It is time to put research into the build-up of carbon dioxide in the atmosphere on a better footing.
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Broecker, W. Unpleasant surprises in the greenhouse?. Nature 328, 123–126 (1987). https://doi.org/10.1038/328123a0
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DOI: https://doi.org/10.1038/328123a0