What evidence do we have that proves anthropogenic fossil fuel burning rather than changes in rock weathering or volcanic activity are responsible for major CO2 changes in the atmosphere in the last two centuries?

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Isotopes of nitrogen clearly fingerprint fossil fuel burning as being responsible.

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Isotopes of carbon clearly fingerprint fossil fuel burning as being responsible.

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We don't have evidence to prove or disprove this.

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Isotopes of oxygen clearly fingerprint fossil fuel burning as being responsible.

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What evidence do we have that proves anthropogenic fossil fuel burning rather th...

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